>>11001180If there are secondhand collector stores near you, call them up and see if they buy collections. They'll probably lowball you, but it will get rid of it all in one go. Plus you know that other collectors will be buying them and have an appreciation for them. You could also take them to a pawn shop, but if they're willing to take them, they'll probably give you next to nothing.
Other than that you can donate them, just be careful donating them to charity shops that are religious backed, they occasionally have policies that prevent them from selling certain items and have to dispose of them. I volunteered for one for a while and every time we got Nerf guns they had to be through into a dumpster because the charity didn't want us selling "guns" I even offered to take them and donate them to another shop that I knew would sell them and wasn't allowed because we weren't allowed to "support other charities."