Monoprice offers its Monoprice Dual Extrusion ABS/PLA/PVA 3D Printer for $699.99 with free shipping. That's $499 under our mention from last summer and the lowest total price we've seen. (It's also a very low price for any 3D printer of this type in general.) It features a dual extrusion head and it can use 1.75mm ABS, PLA, and PVA filaments. It prints at a rate of 24cc per hour.