Most of my games are on PC -- so
I imported my wishlist to IsThereAnyDeal and they email me when anything on it goes on sale on Steam or any trusted third-party retailers.
The best deals are usually from:
- Steam
- Humble Bundle's store
- Amazon
- GamesPlanet
- Nuuvem
- GamersGate
...So all of those.
Origin, too, of course. That was pretty much the only way I was getting Sims 4 and Dragon Age: Inquisition.
I try to steer clear of Amazon for PC games unless it's a price glitch, though. I don't like paying tax for digital purchases if I don't have to. But they've had some pretty snazzy price errors and they always honor it. Not too long after it had released, they accidentally listed Assassin's Creed: Rogue, the 'ultimate' edition, for $12.50 as opposed to the $35 sale everyone else had. Oops.
*yoink*
For console games, usually Amazon because the almost-lower-cost-of-comparably-expensive Nintendo games + free 2-day shipping is hard to beat when you live 3 hours away from a brick & mortar store that sells games.
But I've nabbed a few clean discs off ebay, too. I won't buy used games unless it comes with
everything and looks well taken care of - clean disc, manual, cover art, and the original case in one piece.
I also trade frequently, for PC and console games. Used to kinda trade on here, 'til they banned the buying/selling of things with real world value. Still trade on Steam and other forums, and even on craigslist to an extent.
tl;dr: I am a poor college student with a Jewish surname; I am a pro at sales. :v