Amazon has 3 pack of PetSafe Drinkwell Replacement Premium Charcoal Filters for $3.99 as an add-on item (with $25 order) or less with subscribe and save:
$3.79 with 5% discount
$3.39 with 15% discount
Edit: The 12 pack is also available for 9.33 as an add-on or less with S&S.
This is the cheapest I’ve ever seen the Petsafe brand of these filters, and lowest price ever on amazon according to CCC.
Note this is for the 6-compartment version. The original 2 compartment version is also available for $4.59 or less with S&S.
Forgive me if the links need revision, I’m trying to post from mobile.
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