BGGs site is always a bit confusing to me to navigate, but searching for "pnp" or "print and play" and a contest year will probably surface a lot of good "free" (or at least, free to print....) You can at least certainly get a bunch printed for cheaper than 1 boxed game and if you dont like half of them, no drama.
Besides, board games are dirt cheap entertainment. Assuming a cost of 50 of your local currency, split between four people for entertainment for perhaps six to ten hours is hard to beat. And you can typically sell the games to recover 50% of what you paid.
In fact, if you buy used, and resell when you're bored of the game, if can be pretty much free.
In fact, if you buy used, and resell when you're bored of the game, if can be pretty much free.