I think there may be modern buckling spring key switches. Most modern mechanical switches have their own sound. MX Blues and knockoffs sound like MX Blues, the

I think there may be modern buckling spring key switches. Most modern mechanical switches have their own sound. MX Blues and knockoffs sound like MX Blues, the Box Jades I described have a really really nice clicky noise and IMO the best tactile clicking feeling. You could try them next to a buckling spring keyboard and you may or may not like the buckling spring feeling and sound better. I've used both vintage buckling springs and box jades and I like Box Jades better. They sell switch testers with lots of different switches on them, if you want something really obscure like a modern buckling spring you might have to buy a few of the switches separately, but then you could test them alongside the others.