You can find Used Dolls for Sale, on the 2 Large Sex Doll Forums...(TDF and ODC are the initials for the letters in their name).
But honestly, you’ll find the Prices of Used Dolls, are more than the Cost of a Brand New Doll, from here. Most folks on those other Forums, bought their Dolls from the very expensive Doll Vendors promoted on those Forums.. ie. they paid thousands of Dollars, for their Dolls...
But, check it out, for yourself...