eBay is a PITA but still the best place to sell stuff and get the best prices. Facebook marketplace is good too but has it's own problems. Craigslist is kind of a joke anymore, nobody there. I buy up collections like yours but being on the west coast doesn't make it practical. Also been my experience that once you to get the point of trying to get rid of stuff all the good, small, easy to sell stuff is long gone and it's the heavy stuff that doesn't have a ton of value.