They will pay 7,999 for the superb coffee beans
7,999 for superb coffee beans
7,999 for the ores
9,999 for the silver/gold ore
... I only do those items since they won't put those in their homes or try to sell/give them to me again in the future.
EDIT :: Also, lucky item placement in your home and friendship lvl with a villager is said to increase the chances of them "over paying" for an item in retail.