In the town or the city's vegetable market, there are places where pigeons and black-bone chickens are sold. I used to sell a few voles 1 kg to those shops. I don't know if there are any large acquisitions. It is estimated that there is no place to buy in large quantities. The final consumers are in some hotels in big cities, and it is estimated that the middlemen supply the hotels piecemeal. You can go to your town or city and ask which stores buy voles to see if they are in great demand.