SkimMilk said:were you actually looking at the WTB (want to BUY) threads instead of the WTS (want to SELL) threads?
Look at the WTS for more accurate pricing...
As for EN-EL15, there are 3rd party ones. Look at the mass sales forums. Although I still encourage to go for the originals ($50+).
I was looking at the WTS. You can make a search as well. I can't find any 3rd party en-el15 in mass sale. All is the grip batt type