It's unclear what a dual printer photocopier is. If one is looking for a printer that is also a photocopier, there are many available by a variety of brands. Check out Best Buy or Future Shop.
You can find a wide variety of printer stands at office supply stores. They will carry the most popular brands on the market. You can also find a few other brands on Amazon.
There are many places where one can sell used photocopiers that still work online. There are companies, such as "brkassociates" and "copexinc", that will buy used photocopiers.
Sharp photocopiers can be found through Sharpusa. They sell a variety of photocopiers and accessories and everything one would need for their copying needs.
Office supply stores such as Staples sell replacement ink for printers and photocopiers. Usually you can get better sales when buying from a retailer than from the canon store directly.
A good brand that is a wireless, all-in-one printer would be Canon. Another good brand is Epson. Kodak also sell a printer that is all-in-one and wireless.
Most stores that sell photocopiers will offer an extended warranty for an additional charge. Typically, they will come with a one year manufacturer's warranty.
The following websites sell photocopiers online: Xerox, Staples, Office Depot, and Amazon (among others). It is also possible to find listings for used photocopiers through local Craigslist listings or going-out-of-business sales.
Inkrite Limited sell printers and printer accessories including inkjet and toner cartridges for several different brands. They also sell different types of printing paper from photographic ones to standard office use ones.
Worldwide Brands's motto is 'What To Sell Online, Where To Get It, and How To Sell It!'.
Office Depot carries many brands of printers but mostly HP printers.
Best Buy does sell in for a number of dell printer. They sell ink for other printer manufacturer as well. You can get the manufacturer ink at higher cost or a generic one at lower cost.
Ebay would probably be the best bet for trying to sell new equipment. Take multiple pictures of the printer, it helps to authenticate that the printer is indeed new.