My coffee pot has a reusable one. I had to buy it extra and it was around $10. I love it. I rinse it and run it through the dish washer then it's ready to go.

There are fine mesh coffee filter replacement baskets that you can buy for just a few dollars. Or, if you can't find one that fits your machine, buy the unbleached ones and throw them in your compost.

My brother used pieces of paper towels./

You can get a silk lined basket in the grocery isle near the paper filters - I actually use one for filtering herbs and things I use for my soap. It works great and lasts forever!

Or you can go to a French Press coffee maker.

Some brand of coffeemakers sell their reusable baskets. they are great.

or you can do like my grandparents and great-grandparents did. big coffee pot (like we think of for over the campfire), put on wood burning part of stove, fill with water and put cup of grounds in the bottom of the pot, boil the bejesus out of it and serve by pouring carefully or use a strainer. keep doing this until level down then add more water and grounds. when coffee is too bitter add some egg shells and it will be drinkable again. pour out grounds and egg shells when there are too many in the pot and add more to do it again. don't forget to leave this brewing on the fire all day so it will be ready anytime you want it.

voila!! no filters needed. lol

btw, you will use less coffee too.

But the grounds are really good for your septic system.

I have a cotton one I bought at grocery store several years ago.

I don't understand. Coffee filters are about the cheapest thing on the planet. But just in case you want to spend the equivalent of about 10,000 filters, there are reusable mesh ones you can buy.