I just purchased an extended battery and extended battery door for my 8700g from
www.seidioonline.com. I purchased it on Friday, January 5, 2007, and it was shipped on Monday, January 8, 2007, via USPS Priority Mail. I received it on Wednesday, January 10, 2007.
If anyone has any questions, feel free to ask.
I ordered from SPD on June 25, 2006, and never heard back, so I cancelled my order after several months. I don't even see an extended battery on the SPD website for the 8700g now either. I know when I ordered mine, it was supposed to ship that week.