The Big Beige Box Co.

 is presumably a computer manufacturer or seller that is advertised on billboards in Grand Theft Auto III. It's only sign says The Big Beige Box Co. and then has some unreadable text below that seems to read 'MORE THAN A 8C WHICH BLAMS'. But it most likely says something else, but in too low resolution. There are, however, no actual Big Beige Box Co. stores located in Liberty City.