Monoprice offers its Monoprice MP Select 3D Printing Pen for $19.99. Coupon code "3DPEN" cuts that to $14.99. With free shipping, that's $5 under our June mention and the lowest price we've seen. (It's the best deal now by $19.) It features variable temperature settings, eight speed settings, automatic and manual extrusion modes, and compatibility with eMate and PLA filaments. Deal ends September 30.