I've found Bismuth shot shells for sale in Australia

A$120 per 25 #4 shot 32 gram

I've found #4 bismuth shot for sale. Per 5 lbs is A$269. Per 1 lb, A$54. Works out as A$3.80 per 32 GMs, or A$95 per 25. Shot cost only. 5 lbs makes 70 shot shells.

The guys at the local gunshop that had Bismuth shotshells for sale, said it cost them A$950 per slab, 250 shells. Must have been marked up to A$125.

Obviously one will use good useful effective leadshot whenever one can.

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In USA
US$32 per 1 lb

Midway US$143 to US$160 per 5 lbs, US$28.60 to US$32 per lb