I bought my 2 GB microSD card from
Newegg.com - Buy Computer Parts, PC Components, Laptop Computers, Digital Cameras and more! and got a really good price. I just searched their web site and the references to a 4 GB SD card is NOT a microSD. That is not to say that a 4 GB doesn't exist, but just a warning to make sure you buy the right format. The 8525 uses a MicroSD card (as you all probably already know.)