Elzle via Amazon is featuring (as a limited time deal) the Elzle 2 Pack LP-E6 2000mAh Battery and Rapid Dual USB Battery Charger for only $10.51. This is sold by Elzle and Fulfilled by Amazon.
We’ve never heard of this brand before, but this price is incredible, vs. the $25-30 price of comparable options from other 3rd parties. They have limited reviews, but very positive (average 4.8 stars out of 5).