You can get Sony batteries for under $30 shipped, I just got one in the mail, it's in the original unopened blister pack with holographs and is probably not a fake.
There is another battery thread, I'd stick with an OEM battery it's not too much more $...
|Waffles with fruits by Coolinarka|
from Food photography (desserts)
|Vestrahorn Frozen Reflection by Will B Milner|
from Ice cold