Reach for your copy of Yellow Pages (or go to Yell.com) and find out where the nearest scrap yard is to you. (The category is 'Scrap Metal Merchants').
Scrap metal prices are currently at an all-time high. For example, it's only a few years since I drove my car to a scrap yard which was offering a minimum of £50 for any vehicle which was delivered to their premises. (I got £60 for it). I recently saw an ad for a firm which offered a minimum of £220 for any vehicle, and that included collection by the advertiser!).
I've no idea what 19 radiators will fetch but I'm prepared to guarantee that it will be a great deal more than the cost of getting them to a scrap yard!
Chris