I've still got some Navy Arms musket caps in the 250 count tin. Sticker on the bottom says $2.79 - that's how old they are. Sportsmans Warehouse seems to have a steady supply of CCI in the 100 count tins for just under 8 bucks. I often buy 1 or 2 tins whenever I'm across town and stop in there.
I don't use that many currently, but I do have musket cap nipples to fit several rifles, just in case I run short of #11's.
"Hey Look! We've got Guns ... and We've got Snacks!"
- Cdr. Samuel "Sam" Axe, USN, (ret) -