What seed bank stocks the DDA?
...the ones that carry Sweet Seeds' merchandise. Which would be most of them. Including some of our forum sponsors:
The Vault - Dark Devil Auto Feminised Seeds
Seedsman - Dark Devil Auto Feminised Seeds from Sweet Seeds - Seedsman | Seedsman
Herbies - Sweet Dark Devil Auto Autoflowering Feminised Seeds - Herbies Seeds
Dope Seeds - Buy Dark Devil Auto Feminised Seeds - Sweet Seeds - Dope Seeds
Et cetera. It's a popular breeder and a popular strain; the seeds are not hard to find.
Off-topic: While finding the above, I saw that Seedsman's African Buzz (their version of a Malawi Gold) is available at a great price from them and those who sell that breeder's products. At the source, they're $116.10 - for 100 seeds! That's ~$1.16/seed (obviously), which is probably going to be tough to beat.