I've quit WoW, and no longer need my Honorbuddy key.
It is a 3 session, lifetime key. Listed on their site for € 59.98 (~$82).
I'd prefer to trade it for a US Titanfall full game code ($60, doing it this way will save you the most money) or for $75 over PayPal.
If your OwnedCore account is newer than mine, has less rep, or less posts, I will need to verify that the code works before giving you the HB key/log in for BuddyAuth.
Imgur link for proof of key: imgur: the simple image sharer