V4inktonerink via eBay offers this 1.75mm ABS/PLA 3D Printer Filament 2.2-lb. Spool
five colors (Red pictured) for $14.99. In cart, it drops to $10.99
. With free shipping
, that's the lowest total price we could find by $3. It's compatible with a vareity of printers, including RepRap, Makerbot, and UP! models.