Almost everything else is just cheepchinesecrapola. Koehler cast iron is still made on Koehler, WI.

Try Signature Hardware. Kohler tends to be expensive.

And Signature is cheepchinesecrapola whose faucets are not even certified to be sold in the US. You don’t get what you won’t pay for.

MTI makes some gorgeous freestanding tubs in their employee-owned factory near Atlanta. No bargains to be had, but a good plumbing supply house can beat these prices: https://www.build.com/search?f19797=free%20standing&r=24&s=SCORE&p=1&term=mti%20bathtub

I purchased a Devon & Devon tub that I love -- it was my one splurge in the master bathroom -- not counting the faucets and other things that I splurged on. There's a Kohler Kallista cast-iron tub that's closer to $6K. Will make $3K sound reasonable.