Just thought some of you might like to know, Costco is selling these for I think $9.99 or $5.99. Sorry I forget which, but they're 100% cotton and make awesome little filters. Since they're perfectly round they also fit great in large bottle caps for those diy folk out there.

As a heads up they seem to filter about as well as a coffee filter, but this based on only eyeballs and time; not any scientific evaluation.