I owe the forum so I need to pass this one on.

This vendor, unlimitedcellular, on eBay is selling brand new 770/N800 BP-5L batteries for $6.99 + $2.00 shipping in the US. I received a brand new Nokia battery in a Cingular Wireless blister pack "for the Nokia E62". It's obviously left over stock from before Cingular changed back to AT&T Wireless.

http://cgi.ebay.com/New-OEM-Nokia-E6...3%3A1|294%3A50

I don't believe it's a counterfeit. Charged it up and it works fine.

For some reason they also have a listing for over $56, as well as one that allows you to bid starting at $4.99.

There are a couple of other vendors on eBay that look to be the same or related company but selling under different names. I can only say that I bought from unlimitedcellular, and of course I can't guarantee that you'll get the exact same thing I did... Super fast shipping. They had it out the door the next day.