You could also check on eBay. They seem to have almost everything else.
Originally Posted by bikebryan
I buy all of my batteries on eBay. I am kind of obsessive about always having a spare battery because I use my phone constantly and I swap batteries a couple of times a day. I keep them stashed everywhere, my car, my office, my workout bag, my laptop case.
For most phones, you can buy knockoffs from Asia for a couple of bucks on eBay. I just bought three batteries plus a wall charger for $19
including shipping from Hong Kong.
You do take a bit of a risk when you order knockoffs. Some of them don't hold a charge very well. I bought one batch for my previous phone and it turned out that the phone software didn't recognize the batteries properly since they were made for the Asian model. The phone ran fine, but the batteries would not charge in the phone -- I had to use the external wall charger.
Still, when you are buying 6-8 batteries, it is nice to get them for $7 instead of $30-40 for the official ones.