Thumb Score: +17 Monoprice.com has Monoprice Select 3D Printing Pen w/ Low Temp Safe Mode + PLA Mode for $19.99 - $5 w/ promo code3DPEN = $14.99. Shipping is free. Thanks Discombobulated Deal Editor's Notes & Price Research: The MP Select 3D Printing Pen allows you to create 3D models or repair 3D models by hand.