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Monoprice [monoprice.com] has 0.5kg Monoprice Green PLA+ 3D Printer Filament on sale for $ 5.39. Shipping is free on $ 39+ orders.

Monoprice [monoprice.com] has 1kg Monoprice Black PLA+ 3D Printer Filament on sale for $ 12.35. Shipping is free on $ 39+ orders.

Additionally, save $ 10 on a $ 50+ order with promo code TAKE10.
Additionally, the Slickdeals Extension is offering 25% Cashback.

Example deal: 4x black + 1x green = $ 44.79 shipped and you get $ 11.19 back.