"That's gonna be hard to find at any kind of reasonable price" Unfortunately, Cowboy brass seems to be made of either gold or unobtanium at the present time. Just like L.R. and L.P. primers. B.N. Scotty
Primers are available in all sizes at your local Bass Pro or Cabelas. I had to quit buying them as I am pretty sure I have a lifetime supply. With tax they are around $77 / 1000.
None available at the only Cabelas ( or sportsmans warehouse) here in the Great Southwest…Only small pistol.
Don't know if this is legit or not.........https://www.opticsplanet.com/winchester-32-20-winchester-unprimed-rifle-brass.html
Google tells us it is a legitimate company but with horrible reviews, listing stuff as in stock that isn't, refusing to refund, terrible customer service, etc. They also show 44-40 brass in stock. I would totally avoid them.