What item sold you cannot live without??

I sold a pair of Sony SS M9 speakers. They are probably one of the most underrated speakers ever made. They sound great and sell soo cheap now! I wish I still had them.

My 3 speed mossberg bicycle and a baseball autographed by all the 1973 Cleveland Indians. Audio equipment is fungible.

A pair of Energy 1.8 speakers. I chose the NHT 3.3 for the long haul but the Energys far surpassed anything else I have ever heard in soundstage and layering. A gut wrenching decision.

Sold some common stock for $15 that I paid $7 for. Was so glad to more than double my money, until the stock continued to go up to $80.
D'OH

My problem is the opposite. I have a lot of gear I am currently not using, that I can't seem to part with. Too nice to let go, since they are no longer made..

Thiel CS7s, the original. I wish I had kept them and upgraded them to 7.2 with Thiel's kit.