melsieglass, if you have an Android (Droid) phone or an iPhone or iPad, check out Square! Square is a way to accept credit cards thru your phone! Yep, it works! I've been using it for 3 weeks now and it's helped at every show!
First show I used it at, 3 of my 5 sales were credit cards. Second show, I had 6 or 7 credit card sales but LOTS of sales (shoppers tend to bring lots of cash to that one since it's an antiquey/flea market sorta thing). Third show (this past weekend), I sold a $95 Santa doll because I was able to accept credit cards! Also had a couple of smaller ($10'ish) credit card sales.
Even if your wireless contract isn't up for renewal, chances are your carrier will give you a decent deal on a new phone! My Motorola Atrix 4G was $150 "out the door" at the AT&T store. $15 of that was for a screen protector, cuz I didn't know they were available online super-cheap and about $35 was sales tax cuz they have to (or get to?) charge sales tax on the full retail price of the phone ($699).
The Square "gadget" is free from Square, and they charge just 2.75% with the money going directly into your bank account in about 3 days. You'll get an email as soon as you've completed the transaction which shows you that they've received it and they'll email you again when they initiate the deposit process.
http://www.SquareUp.com