I was in the same situation recently with thousands of spare comics, what I did was calculate roughly what my profit would be from their original prices then kept the keys for Ebay and the others I sold to a vendor who did conventions. What I did was visit this vendor and built up a relationship with him and explained my situation to him, I had sold at conventions myself and was enjoying it immensely until my health told me to stop. I worked out the above total for profit and he was more than pleased to help me out, a win win situation.