I already have a coinbase account, but I clicked the referral link for good measure. I had not kept up to date on this microtransaction option, so thank you for resurrecting the thread with useful information. However, I'm reading through and as far as I can figure the customer would have to be a Coinbase user to get the fee-free transaction. Makes sense of course, but I need to walk through the check out process and see what happens for a non-coinbase user.
For now I'm going to add Coinbase as a third option, and I'll run it through and see how it feels.
Thanks for the referral. You may be right about the customer having to be a Coinbase user to get the fee-free transaction, it would make sense. There are, however, about a little over a million users, if you're willing to believe what they say on their website. They don't, obviously, say how many of them are people like me who have only bought bitcoins once and never really touched it since then. I wished I had bought some more back in August, but oh well.