Just doing a bit of 'laptop housekeeping' here at The Hookery and I came across a spreadsheet to help with pricing. Pricing is a bit of a nightmare. It's also been a bit of a shock. I just plugged my costs into this spreadsheet and basically, I'm not making very much.
For each item you make, work down the column plugging in the costs of the materials used (don't forget to include your time) and how many items these materials made. Then enter how much you'd like to charge for an item and the spreadsheet will show you what you'll make after listing fees and commission (I think these are accurate - I'm assuming Paypal still charge 20p + 3%, but could someone let me know if this is wrong?). There's a bit at the bottom to enter postage costs so you can keep a record.
Anyhow, you can download a rough-and-ready ODS version from Google Documents here or let me know your email address and I'll ping you a pretty copy in Excel.