Today only, Monoprice offers its Monoprice MP Select 3D Printing Pen for $24.99. Coupon code "BIG20" cuts that to $19.99. With free shipping, that's $5 under our mention from three weeks ago and the lowest price we could find by $16. It features variable temperature settings, eight speed settings, automatic and manual extrusion modes, and compatibility with eMate and PLA filaments.