Hi, I know of one chain called Buy Sell Station, they've got
about 5 outlets, the nearest one to you would be at blk183 toa
payoh central #01-300. You can check out their ebay store, id:
buysellstation.
Price they offered for my xbox 360 game was quite bad like $5,
probably cause its not popular, but they offered $8 for
each of my used Wii games... I am not sure about PS3 games.. You
can also try out the store at tampines mall at the highest
floor about a few stores to the left of the arcade, they offered me
a better price for the xbox n wii games.