I've got some spare english tack (Korsteel bits, Jimmys bridle, martingales, blankets etc) and I've tried the facebook groups but doesn't seem to get a lot of traffic. Do people still look on ebay for tack? What's a good place to sell tack online that has a fairly quick turnaround?
Craigslist, bits and barter, and honestly, facebook groups. I'm not sure which ones you've been trying, but look up English Tack Trader... that one gets a ton of traffic, and as long as things are priced right (and you have good photos and descriptions), they tend to get sold pretty quickly. Good luck!