I just wanted to share the deal I found on a spare battery with 200 extra mAh. I would imagine that this does not have the NFC chip, but I wasn't too concerned with that as of yet since I don't use any tags yet anyway. I spent a little over $3.00 with shipping for one battery. I figured even if it was garbage, I'm not out much money.
Replacement 3.7V 2300mAh Battery for Samsung Galaxy S3 i9300 China Wholesale - ahappydeal.com