First off, am not associated with any eBay Seller. I was looking for an alternative to the $60.00 OEM battery that Olympus sells.
I found a good battery that has the same specs as the BLN-1 battery, 1450 mAh, and 7.6volts for $13.00 a piece, the only caveat is that you must use the charger that is sold with a Kit or separately from the same eBay Seller.
Here is one seller that always has batteries and chargers available. Either in a kit, or sold separately.