I like to point that can be mods there but mostly they are not working due to not be update or some other reason. I think even Merchants is different offering ( selling or buying), but what I suggesting here to be same, in the way what they offering, but to be different in buying. I like to sale what ever we have extra. For example if I have 10 seed of tulips and I go to correct merchant ho is buying that kind, I like to sell. And also if they are refreshing selling / buying staff in some period of games days they should refresh same that is ok, but still I like to be able to sell some product what I don't need.
Second suggestion is, also I know have mod but is outdated not working and mostly will not be updated, but that should be in vanilla game long time ago, we building houses so that should be part of house. I think trash bin will be so nice to have for some also extra materials what ever we really don't need or considering not value for selling.