Amscot have the option to short, here's a copy/paste off their page Short Selling
amscot offers both online and phone based short selling through Leveraged Equities.
Leveraged Equities' Short Share facility offers short selling over approximately 110 securities, with Lending Ratios of between 15% and 50% being offered.
Short Sales are only offered in parcels of not less than $50,000 per stock.
Please note: a separate amscot account is required for short selling.
To view the terms of Leveraged Equities shorting facility click here.