I recently was forced to move and did a major sell off of studio gear. A lot depends on your specifics, where you live, are you moving ,etc. Ebay could work well especially if your location is remote and you intend to remain where you are. It didn’t work well for me at all: I had much more success just using Craigslist. I’d been a little reluctant to use CL previously as I’d been concerned about people coming to my place but since I wasn’t going to be there; no concerns at all. I was amazed at some of the items that I never thought I’d find a buyer for that I was able to sell including a
Kustom roll and tuck guitar cabinet
Fostex A8 reel to reel
Commodore Vic 20
Atari 520 ST
Sequential Circuits Drum Trax
and a whole lot more. I was right in San FRancisco ,which helped and I’ve always believed most musicians are a bit different from the general public; they just want the gear and no hassles.
I tried Ebay for a midi interface that I knew I could afford to take a loss on. Ebay takes alot of time and they purposely don’t make it easy by hiding the feature that would allow the seller to set a minimum price (you can find it,but should be right up front.) I sold an 8port midi interface for .99 cents, thanks to their constant relisting. Ebay could probably work well if you have time to devote to watching your auctions and every minutiae of the sale because there is always some jerkoff waiting to give you a bad review for something minor.