Oline shops for your website?

I run an online site which relys on donations to keep it up and running. People have said they would pay for merchandise with our logo on like T-Shirts, Mugs etc etc. I looked around and found cafepress but find there general price is very expensive. Does any one know of any companys that offer you the chance to run an online shop taking payment and dispatch items and charge the customer plus a little extra for us to make some money on it?