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GoldTone Activated Charcoal Water Filters Fits All KEURIG Coffee Machines, Mini, Classic 1.0, 2.0 Replacement Filter (12 Pack)

$9.49 at Overstock.com

GoldTone Reusable Kcup Coffee Filter Fits Keurig 1.0 K Cup - Permanent Reusable Single Serve Replacement Filter (2 Pack)

$9.99 at Overstock.com

GoldTone Reusable 8-12 Cup Basket Style Filter Replacement Fits CUISINART Coffee Machines and Brewers, BPA Free (1 Pack)

$8.19 at Overstock.com

Bambu Activated Carbon Air Filter

$15.09 at RepRap 3D Printer Shop

Lian Li Lancool 207 Front Dust Filter

$5.33 at Scan Computers

GoldTone Reusable 8-12 Cup Basket Filter Replacement Fits ALL Black and Decker Coffee Machines and Brewers, BPA Free (1 Pack)

$7.00 at Overstock.com

Lian Li Lancool 207 Front Dust Filter

$5.33 at Scan Computers

Marlboro Filter Black

$4.59 at CigaretKretek

SilverStone 120mm Honeycomb Fan Grille Dust Filter White

$4.01 at Scan Computers