Don't know if it's still there, but down at the Ghetto, Gerrard Sq, upstairs next to the eye glasses place but i haven't been there in a few years so...don't cuss me if it's not there.
I think your thinking of Icemans, I heard about them, but apparently they have closed down? ir atleast thats what the dude I called said!
I'm familiar with roms but I'm really into retro items these days and I was given an classic NES system for x-mas, I'd just like a few games to go with it!
I also know I can order them online via ebay/CL etc... I just cant be bothered by that though and would love to paroose a shop!