Training Herblore in RuneScape can be very expensive. Here are some ways of obtaining specific secondary ingredients, to help reduce the cost of training Herblore, primarily for herbs obtained from the Managing Miscellania activity.
This is probably the best potion to make with Avantoe. The other potions are untradeable, not as popular to sell, or, in the case of the Fishing potion, waste Snape grass which is more valuable in Prayer potions.
Go into Mort Myre and use the Bloom option of either the sickle or flail on nearby dead logs which may produce the fungi. Bloom uses up Prayer points. If low level, be careful that the nearby Ghasts don't kill you. Using a Druid pouch may be required.
Close to the entrance of Mort Myre is a location where there are three logs that can have bloom used on at the same time when standing in the correct place, increasing your chance of producing fungi.

The only potion that can be made with Cadantine, this potion is nearly worthless. The secondary ingredient is White berries. Given the cost of the White berries in comparison to the value of the potion, you are advised to grow your own at one or more of the various bush patches.
The secondary ingredient in a ranging potion is Wine of Zamorak. There are only two ways to collect this; either purchasing it from other players, such as through the Grand Exchange, or collecting it yourself.
Wine of Zamorak is available at only one location, the Zamorak temple south west of the Goblin Village, where it is on a table. If you pick it up, you will take damage and suffer a reduction in combat related stats, and the nearby Monks of Zamorak will also attack you. This method is not advised.Potions that use Harralander as a base are very unprofitable to make. They are all worth only a fraction of the cost of the ingredients used, so it may be better to just sell the Harralander or the ingredients than make the potions.
Requires Red spiders' eggs. The best way of getting these is with a Spirit Spider Summoning familiar. They can be collected for free, but most Red spiders' egg spawns are some distance from a bank.
Requires Chocolate dust, which is obtained from grinding Chocolate bars. There is a Chocolate bar spawn inside the Cooks' Guild outside Varrock, which requires a Cooking level of 32 and a Chef's hat to enter (the hat isn't needed if the Varrock hard tasks have been completed, which also allows use of the Guild bank), in a house in Draynor Village, or in Zanaris (requires Lost City).

Requires Goat horn dust, which is obtained by grinding Desert goat horns. These are dropped by Goats and Billy Goats in the Kharidian Deset. The desert requires some protection from dehydration, such as a Waterskin and a Knife for refilling the skin from cacti, or the Enchanted water tiara which requires Dealing with Scabaras to make. Some goats are on the coast just to the west of Fairy Ring BIQ, the one near the Kalphite Hive.

Requires a Ground unicorn horn. Unicorn horns are obtained from killing either Unicorns, or Unicows in the Creature Creation activity. Creature Creation is the quickest way of obtaining horns, but you can also kill the two Unicorns in Edgeville not far south of the bank. They respawn fairly slowly though.
Requires a Limpwurt root. Limpwurt can be grown by planting a Limpwurt seed in a flower patch, which if the plant survives will give three roots on harvesting. This is not a particularly effective method.
Edgeville Dungeon - There are level 28 and level 42 Hobgoblins just north of the entrance ladder from the house mentioned previously. For banking, use the same method as mentioned above.
Crafting Guild Peninsula - There are many level 28 Hobgoblins on the peninsula near the Crafting Guild. Although not near to a bank, the bush patch in Rimmington and its' leprechaun are close, so when your inventory is full, you can run there and have the Limpwurt roots noted by using them on the leprechaun. Alternatively, you can run a bit further to the Rimmington Customs Office, if the Rocking Out quest has been completed. The locker there functions as a bank deposit box, allowing you to empty your inventory.
Witchaven Dungeon - There are four level 28 Hobgoblins just inside the entrance to the dungeon. The entrance itself is not far from the East Ardougne east bank. Interestingly, these Hobgoblins seem to drop valuable herb seeds more commonly than those in other locations.
This requires Dragon scale dust as a secondary ingredient. Dragon scale dust is obtained by grinding Blue dragon scales, which spawn in the Taverley Dungeon in the room with the Blue Dragons, and in the resource dungeon accessible from there, which also contains Blue Dragons.

Requires a Potato cactus and is made at level 76 Herblore. The Potato cactus spawns in a total of 14 places in the Kalphite Hive in the Kharidian Desert. The desert itself is dangerous, and the best access is through the Fairy Ring network using code BIQ.
Kalphites are dangerous and, in the cases of the Soldiers and Guardians, poisonous. Antipoison potions, the Dungeoneering reward Anti-poison totem or the Members Loyalty Programme Poison purge auras are recommended to prevent death from poisoning.
This is one of the most popular potions around, and is usually in demand. The secondary ingredient is Snape grass, which is dropped by some monsters, but also spawns in a number of places, such as the Crafting Guild peninsula. The ones here can be banked in the Rimmington Customs Offices locker.
You can also, after getting the Fremennik sea boots 3, change the Enchanted lyre teleport to Waterbirth Island.
Requires a Limpwurt root, see Super strength under Kwuarm.
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