I said I would follow up, so here it is.
Paid by Tapporo on January 18, 2013:
Click here to read more about Tapporo. Currently available on Android, and coming soon to iOS.
If you sign up, it helps us both (we both get a bonus) if you use my invite code: TAPJB1597
They offer PayPal, Amazon (as seen here), and many other redemption options. My Amazon redemption was nearly instant (within a few minutes) and I had no issues redeeming it.