As every guild out there knows, bidding on a guild merchant can be frustrating at best. While wearing your guild tabard, you could be able to summon a guild merchant as a follower or pet. This merchant could also offer repairs and just to sell off to make space in your inventory.
The merchant should have a few to pick from, for example offer a few of them to choose from as a vampire guild might just want that vampiric look for their merchant as well.