You can short SPNG with interactive brokers: Actually they are reporting 1,400,000 shares avail to short: Shortable Stocks Shortable Stocks for United States SPNG USD Spongetech Delivery Systems Inc Check Availability Last updated:Fri, 03.Jul.09 02:28EDT Symbol: SPNG Availability: 1'400'000 Exchanges: PINK, ARCAEDGE, NITE, IBSX, OTCBB <a href="http://www.interactivebrokers.com/en/trading/ViewShortableStocks.php?key=spng&cntry=usa&tag=United+States&ib_entity=llc&ln=" rel="nofollow" target="_blank">http://www.interactivebrokers.com/en/trading/ViewShortableStocks.php?key=spng&cntry=usa&tag=United+States&ib_entity=llc&ln=</a>