Hey there,
I have a cross-faction guild (guild bank and guild chat can be used by members of both factions, and you can invite both sides) on US-Frostmourne that I'm looking to get rid of. It's level 1, and doesn't have any bank tabs but the nature of the guild itself is valuable, especially since hotfixes to the exploit are presumably imminent. I'm willing to trade a MoP key (realm street price 40k) for it.
If you're interested then PM me or add me on Skype at duders.duderson and I can show you the guild and how it works.