Families sell everything they own at scheduled house sales when they are returning home. These sales are where you can find bargains on used items in excellent condition.
You can subscribe to the mailing list of the organizer at mariamaranessi.com and receive notification every Wednesday for the weekend sales. The emails contain the date, address of sale, and hours, and a detailed list of what is being offered for sale, photos of what is being sold, but not the prices. You present your DNI or passport to an employee at the entrance and then wait to be called to enter. Sales are paid in cash only. Go one or two hours before the sale opens at 10am if there is an important item that you are ready to buy.