How about Shanghai Yaqu stamps?

It should be possible. Zhao Yong Online, Shanghai Stamp Network and Shanghai Yaqu Stamp Network are all available stamp auction networks. The auction is entrusted by the seller, and these auction websites play the role of appraisal. You can know something about the auction, and decide whether to bid and how much to bid according to their descriptions and pictures. However, the number and types of lots of Yaqu are a little less than those of the first two, but Sida-China Postal Card Network, one of the famous domestic postal merchants, can list "Yaqu-style tickets/annual tickets market" on its website, which shows that it should be recognized by many people.