Where would you purchase a digital download/key?
Good question. Aside from Blizzard themselves (battle.net), I'm not entirely sure. I'll try digging around but these days I buy games almost exclusively off Steam unless it's not an option so I'm out of practice.
OK, I can do a Blizzard.net key. Made an account on there and read that it can be gifted.
Send 12 BTC to 1LzxJFYowMXb3Ci825dFtBuL1CUCQ7GEaY and PM your email.
-tsvekric