Sign up for the Capital One Spark Cash for Business Visa Card and get a $100 bonus when you spend $1000 in 3 months. Plus, get another $50 back when you sign up for one or more employee cards within 60 days. This card gets you 2% back on every purchase- the best cash back rate we've seen for any business credit card. There's no cap on the amount of cash rewards you earn, you can redeem them at any time, and they never expire. On top of that, the $59 annual fee is waived the first year. Note: Business cards can be used by individuals, like sole proprietors, which you are if you merely sell things on eBay, or members of an LLC . Simply select "sole proprietor" for "type of business" and then enter your name as the legal name and social security number as the Tax ID number.