John, you've done as well as can be. For the Eley Grand Prix HV shells, $55 is the best I've been able to do here. $65 top price.

Don't believe anyone imports bismuth shot for sale; it can be brought in privately, but is still very expensive, and you need an import permit [as a cartridge component]. Loading data is a bit hard to find too.

Only other option is to make the stuff, as Marrakai does......

Haven't been able to check when the Oz patent on bismuth shot runs out, but the US one should expire mid next year [unless it gets extended].