Shopify now has support for the SkipJack payment gateway . SkipJack supports both US, and Canadian based merchants, connects to almost all banks in the US, and supports the processing of all major credit cards including VISA, MasterCard, American Express, JCB, Discover and Diner’s Club.
Some more information about “SkipJack” from their homepage:
Skipjack Financial Services was formed in 1997 to meet the needs of both the financial community and their merchants for a secure, affordable, feature-rich payment gateway. Skipjack grew rapidly based on its reputation for service excellence and its ability to meet the needs of merchants of any size with payment solutions designed to meet their specific needs.