USPSA does build most of the "need" for these revolvers though and the options are really targeted to gun gamers.
The S&W 10227 986 2.5 is still built on the 686 L frame. I don't think most are carrying even the 38/357 2.5" 686 or the GP100 in 3". That one is truly niche and probably why there is exactly one for sell online using gun.deals
The 45 revolvers also exist pretty much only for gun games because of the short round loads super fast.
The S&W 627 38/357 is stainless, yet unlike most all revolver pricing, costs less than the blue S&W R8. Gun game gun without the crazy R8 "self defense/duty" appeal pricing.
All I'm saying, is the 9mm, 40, 45 revolvers do exist in large frame. It's for USPSA. Someone saying they don't exist just don't know about it. The Brian Enos forum is enlightening on the subject of race revolvers. It's hard not to take away most get into the idea and back out of race revolvers though.
With 9mm being the main build right now for all US sources, it's not a crazy idea to look into an auto ammo revolver. $40 for 357mag FMJ is just kinda stupid waste of money, no matter your income.
However, the ammo problem is a US only problem. Non US 38/357 is still available. Just have to get the US sellers to act like it isn't a problem. Swiss owned Ruag sells 38special right now for cheap. Direct to consumer with free shipping. Normashooting and ammoshoponline have had 38 and gone for a bit 357 through this whole deal and it has been no higher than $35 for 357mag and $30 for 38spc. This whole time. Kudos to Ruag. It's interesting to watch South Korean PMC 38 special pricing online. It seems to be stacked deep but online retailers just keep bumping the prices incrementally down to see how much we will cough up for this ammo that is clearly not scarce.