Some people have noted they can't find caps, try the following.
https://www.wholesalehunter.com/Prod.../11144590?fs=1
https://www.midwayusa.com/product/1022777938?pid=574384
Wholesale hunters had 485 standard #11's three weeks ago (I think that is lots' of 1,000).
Add to the list if you know for sure a company has them.