We also get ours at our Walgreens Pharmacy, but the only way they’ve been selling them is like a kit with the little brush cleaner & a another little piece -each one is about $6.  I know someone posted about that a couple months ago on here & there are some places you can order a bulk amount very reasonable -I think they said they would even send samples.  Maybe you can search through here or they will post again. -for right now though your pharmacy should have them.  Best wishes!

Darlene