Google has this website thoroughly indexed, so if you know what you are looking for, Google will know where to find it.
Ebay is a great place to buy used equipment, but you have to take care who you deal with since there are crooks and scammers on Ebay just like everywhere else. It's also reported that many of the memory cards being sold on Ebay right may fakes and may be either unreliable or may be lower in capacity then they are marked. Just be careful!