It's kind of a tradeoff between price, weight and immediacy. For expensive gear or gear that is inexpensive to ship, going on the forums to sell is a good option. People here are very into gear, so you know it will be appreciated by someone. It is a buyers market, so you should expect to be low-balled quite a bit.
On the other hand, if you have something that is not too expensive and/or expensive to ship, you can always sell it at guitar center. I know people love to hate them for their very low offers, but you have to consider the role they are playing, which is market maker. In short, they are willing to offer you immediate money for your gear, without knowing when they'll resell it or for how much. Providing this kind of liquidity requires a substantial return.
I've mostly preferred to sell on TB and most of my items were expensive enough and easy to ship. Also, I like that my old items are in good hands. That said, I have sold some inexpensive and heavy cabinets to GC - the shipping costs would have eaten up whatever extra I would have gotten selling here.
Luckily I never had to sell in a distressed situation, so I'm sorry for the OP.