What part of the country are you in?
Pricing depends on how badly you want to sell it.
Assuming good condition, under $500 it should sell fairly quickly. Over $500, it will take a while. There are a couple around $600 in the exchange forum that have been there for a while.
Single shot .22's are a hard sell - to move quickly they have to be priced right.
They show up in the stores for $450 to $500.