I bought the Samsung extra battery/charger kit from Sprint store. It was $49.95 and if you buy another item you get 20% off so the battery kit comes to roughly $39.95.
...and it is the HFC battery that is included.
I agree with above, do not buy chinese batteries off ebay.
I am looking to get a spare battery for my wife's Galaxy S3. The cheapest I have found it is $42.99 for the NFC battery and charger with free shipping. I was wondering if anyone has found a better deal? Thanks!
I have always used OEM batteries for my devices. Sure, you pay a bit more but I know my battery won't overheat or damage my device. You get what you pay for.