I got my PS3 from EB Games (60 gig BC model + extra controller + Madden 07 for $900)
I got my 360 off Amazon.ca (20 gig pro model + Call of Duty 4 for around $450)
I get my new games from EB Games
I get used games at a pawn shop near my school - they usually sell them for around $5-10 less than the used games at EB games and you get a 30 day return on all used games.