I'm looking for a business credit card that offers low interest and cash back on business purchases.

Citibank has one of the best credit cards for small businesses. It offers 0% interest on balance transfers for 12 months and you can earn up to 3 thankyou points for every dollar you spent. Points can be redeemed for cash, gift cards, merchandises and more. It is the best way to finance your business needs. To learn more or apply for this card or other business credit cards, you may go here: http://www.creditcarda-z.com/business.asp

if you are a sole proprietor, it will be based on your personal credit score and income level, just like any credit card

Most banks have some kind of business credit program. You may want to check with your local bank.