I am seeking information on dealers or other sources to sell a collection of records (~200). They are all in good-mint condition. A client of mine is a retired record producer and has asked me to help him sell some of his collection, and I have unfortunately never dealt with vinyl so do not even know where to start. I assume many probably have little to no value, but he believes there may be a few that are rare or valuable. I know many head-fiers are into vinyl so I thought this was the logical first place to start my search.