BCN3D has a number of printers with different form factors.
Creality makes the CR-10 DIY printer kit. It is fairly inexpensive, with a large print area. I could not find a good URL for them.
FlashForge is a mid-market printer manufacturer.
The Monoprice creates a low-cost family of printers including the Maker Select and Maker Ultimate.
The Prusa is a popular printer that many others copy. This is the genuine printer.
Tevo makes low-cost 3D printers for DIY kits.