Where can you buy Jedi Knight Jedi Academy for PC

Unlike a lot of older games, Jedi Academy is quite popular and quite rare to find used for PC. So, if you check out eBay or any other online sites, you're likely to be paying near full price or more even for a used copy. I've been trying on and off for two years to win one off eBay for a reasonable price (which to me is under $30) with no success.