Arcade1Up’s 3/4 sized arcade cabinets have been a hit with our readers, and you can save $50 on a couple of them for the first time this Black Friday. The deal is only supposed to be available on the Pacman and the Galaga/Galaxian machines, but now it seems that all of them are included (though not all are in stock at this moment)
Walmart also sells a riser that brings the cabinets up to standard arcade cabinet height, so that might be a good way to spend your savings.