What is the best laptop to buy for gaming with a decent price

It depends on what you consider decent.
My best advice would be to build a laptop yourself, starting with purchasing the laptop shell itself and buying in desired hardware. Though some research is going to have to be done on your end, overall it will be a highly beneficial experience.

Also, don't go for an Alienware laptop. Though they do their job well, and aren't overrated as people say, they are still overpriced. You can build a better laptop for even half the price. You just have to know how to build one. For tutorials or help, try NewEgg.com's tutorials and forums.