For the eager and manually adept...it looks like the specs on the Kobo battery are:
H503456 1000mAh 3.7v
One manufacturer's website info on this battery:
http://www.alibaba.com/product-gs/37...6_1000mah.html
A picture of Kobo disassembled, showing battery:
https://fjallfoss.fcc.gov/prod/oet/f...ive_or_pdf=pdf
So...all we need is some enterprising person to buy a lot of 1000 batteries, and turn around and sell them on eBay to the rest of us. It looks like the batteries could be bought for $2 a piece. I would be willing to buy one for $20. The break even point is selling 100; the chance for profit is pretty good!