Hey, I discovered a little blip in the FAQs that might want to be updated.
http://www.gaiaonline.com/info/help.php?view=category&id=28#158
While at a store, you can click-select any item in your inventory. It will bring up the following choices:
* Sell -- allows you to sell an item back to the store. The standard buy-back price for a store is 50% of the store price.
* Cancel -- stops a transaction and closes the window.
* Give as Gift -- allows to you wrap the item as a gift and give it to a friend or any other Gaia member.
With the new store system, your inventory doesn't show up like it did before.
You have to go to your own inventory, outside of a store, if you want to sell back/giftwrap items.
Maybe I'm slow, but this issue had me running around for a few minutes before I figured it out on my own, haha.