Amazon has the Keurig My K-Cup Reusable Coffee Filter for $5.34 with FREE Super Saver Shipping and $35 purchase or FREE with Amazon Prime.
This is a great way to save on coffee for your Keurig machine, if you don’t like buying the actual k-cups. This is actually what I use every single morning when I make my coffee in the Keurig.
Pricing was current when the post was published, however Amazon prices change often, so please check before you buy.