Watermelon T.

It's just a site where you answer questions the community makes up. Surprisingly fun.

The games you buy on this site you can download on any compatible computer you own, since the games you have purchased remain in your library. The games are good value, and go on sale frequently-I once purchased the entire Half-Life franchise for $10 dollars! Refunds are an issue though-if you have owned a played a game for over 3 hours you can't refund it. There are some really good games on here!

I had the most fun in Deathmatch Mode, it's like Half-Life deathmatch but with more players.
The only problems are that some animations are broken, and that it takes a few hours to download. But I found it to be a really fun mod, especially since I'm apparently so good at TF2 that in my first time playing Deathmatch I topped the scoreboards.

I bought a few things off this site, not many though. I've seen a lot of people who had bad experiences from this because they didn't buy responsibly, but just make sure the seller you're buying from has a good reputation. The purchases I made took a long time to arrive but were exactly what I asked for at a fairly low price. However I have had no experience on selling.