Fulfillment by Amazon would be awesome for this. Free two-day shipping and the site wouldn't go down. Edit: Seriously, you send them a big box, and they mail out all the little boxes. Check it out: http://www.amazonservices.com/content/fulfillment-by-amazon....
how would they handle RMA? RMA for such devboards are very common, even the TI folks had several issues with the recent BeagleBone...
The TL;DR is that Amazon will take back units, and if they're marked as bad (presumably by the customer), Amazon holds on to them in their center, and can then ship them back to you.
It's basically exactly the same as normal retail.
[1]: http://www.amazon.com/gp/help/customer/display.html/ref=hp_r...