I used this one, as recommended on this board, about 2 weeks ago. Fantastic experience! Great prices, lots of neat looking pins. I'm not an expert pin trader, but my kids want to try when we go in Dec 2010, so we figured that's a good Christmas present for them this year. I ordered them on a Monday afternoon, and they were in my hands by Wed. night. You can choose how many you want to buy and either buy it now or bid on a lot of a set number. You can choose if you want shipping included in the price of each pin, or pay less per pin but pay for shipping. It depends on how many pins you're buying. Good luck and Merry Christmas!
Kathy
http://myworld.ebay.tradepinsforyou
PS - sorry to hear about your daughter's lost necklace. I hope whoever took it gets what they deserve!