Amazon has the filters for the Philips Air Purifier Series 2000 discounted to $38 each (37%-52% off!)
Great price. Looking at my last order, I paid $70+ for the HEPA Filter.
This is the lowest price it's ever been, by a significant margin, according to CamelCamel.
Philips Nano Protect HEPA filter FY2422/30 - $38 (52% discount / RRP $79.95)
Philip Nano Protect AC filter FY2420/30 - $38 (37% discount / RRP $59.95) - No subscribe and save -Out of Stock