‘For-sale vending machine’ – insert your old phone or items and add a price
Pay to rent a slot in a large city centre ‘shared vending machine”, add the stuff you want to sell and name your price for each!
Get money for your old watch, your shoes, jewellery, your old phone or anything you no longer need. Get notified when someone buys one of your items or if you need to recollect stuff that didn’t have any takers.
You could set these machines up to use cards only rather than cash and place them inside or outside shopping centres or at the exit and entrance of large car parks.