Cheap 22 snap caps that work

Nine cents a piece and they work great.

Cut an edge off the rim to let the extractor miss the anchor.  Then you can cock the pistol without having to reinsert the anchor.    I cut two sides so that I can turn it over when it gets worn on one side.

If you buy them by the box of 100, they are about 5 cents each.

From the comfort of your own home:
https://smile.amazon.com/dp/B000H5WVCS/

They are pretty darn durable. Harder than some other anchors. Pin leaves a nice dimple but doesnt tear the shoulder

I've been using them for years.