I agree that they should be ramping up production to meet the demand there is. I also find given the educational angle that 1 per order is a quite fair way to go about distribuing them given the lack of supply.
The point on the delivered cost being the key is that many of the boards that would also be suitable for simple tasks like this are either free/very cheap shipping, or at the worst case you can amortize the $5-10 shipping charge across 10 units instead of 1.
What are you looking to do with them out of interest?
I just make weird things out of them. My latest one is an RC car that I was hoping could get some mapping software onto, and turn fully autonomous, although an ESP8266 talking to a laptop is acceptable (and what I'm currently doing).