Commercial Printers?

There is A LOT of money in commerical printer sales and disassembly. Just the printer heads on a 44" printer can sell for $350-2000 used if working and clean. The plastic casing parts even sell for good money. Do the usual by taking note of the models and checking ebay's sold listings for whole machines and parts. That'll give you an idea for what you might expect. As scrap they're not generally any more impressive per pound than office or desktop printers.