You will need to be Steam friends. Last time I did a trade, Blizzard required a 72-hour clock to be ran down before I could buy and send the keys - assuming Steam is the same as it has been, shouldn't be too terribly hard.
Depending on what you're willing to pay ratio wise, I'd consider doing this for you.
Let me know.
PMed
Steam should do, or some other method, looking for someone selling this. LMK price.