Suciton (vacuum) cups Rental in NYC

Dunno if you guys have Harbor Freight Tools over there. They usually have suction cups for $4 or so. Not sure if they are big and good enough for your purposes, but if they are, it might be cheaper to buy them (and rent them out later :icon_mrgr).

Those won't work, I am looking for something like this:

http://www.grainger.com/Grainger/POWRGRIP-Vacuum-Cup-6A987