Based on my recent experience, this could end up costing you... eBay seems to have recently been underestimating shipping charges quite a bit (ex. Last ball I sold..eBay calculated $17, online ups charged $23). Also, with eBay and PayPal fees, packing materials, and time/gas to get to the UPS store, you almost need a $25+ sale price just to break even.
Play if you will, but this is a friendly reminder that it will likely cost you!
S^2