That's cheaper than reloading them, if cost is the only consideration. Bought from Rotometals #3.5 bismuth shot is $1.17 per 1.25 oz. At $319.99/case you get the loaded shell for $1.28.
However, for many of us, cost is not the only consideration. We've got guns that we don't want to put that heavy a load through (almost 4 - 1 1/4). I wish they'd offer a 3 1/4 or 3 1/2 - 1 1/4 loading. I reload to that and find that it hammers big ducks plenty hard enough and plenty far out, with tight chokes. Have gone 6 for 6 on with that load over dekes.
Once I run out of shot I'll likely try these. They're gaining a big following. Pricing as cheap as Roger's for Kent, and American owned and operated. Copper plated bismuth.
https://bossshotshells.com SRH