Exactly what the title says, where do you get Lott brass?  I can't find it, and have a new cz in that caliber.  Do I have to buy loaded ammunition to get cases?

I did some google fu and didn't find anything in stock for just brass. Perhaps you're on the right track with just purchasing ammo and keeping the cases. For some reason PSA was coming up as one of the cheapest sources I recognized on AmmoSeek: https://palmettostatearmory.com/ammo/rifle-ammo.html?caliber_multi=.458+Lott

Thanks.  There is a place in Canada that has it, but they won't ship to the US.

Doesn’t the 458 Lott also chamber and shoot the 458 Winchester?

Unless you are over run with rampaging elephants, 458 Winchester should get you buy short term.........

Wiki says the case is a blown out 375 H&H case
Don’t know if that helps

Also somewhere was an article critical of Guns and Ammo hyping the cartridge due to Jack Lott being
one of their writers. The consensus was it wasnt that big of an improvement over a 458 Winchester

I would keep an eye on the for sale forum over at accuratereloading. It comes up for sale a couple of times a month. If you just need it for practice make some from 375 H&H.