It is their fault. Because they emailed their trusted customers about the deal saying it would be available from 6:30-10:30 PST. If it was just Amazon selling something I wouldn't complain. But Obi never mentioned that the first 30 minutes would be restricted to Amazon prime customers. I was ready to buy and thought I had a comfortable 30 minutes to do so. But no. And then within an hour afterward all gone. That's unfair. And totally contrary to a 4 hour time window. This should be pointed out to them for future reference - if they have any interest in decency toward their customers.