I have 66 RK Red switches which are basically brand new. I purchased an RK 66% board and immediately replaced the switches with vintage Cherry MX blues. They have been unsoldered but other than that they are perfect.

They'll hopefully be of some use to someone - I believe they are rebranded Kailh reds although I can't be certain. £15 takes them and that includes postage to the UK, £20 total covers shipping to the rest of the world. I'd also be open to swap these for tactile/clicky switches.
I also have an old Vintage MX style plate, I can't actually remember what this came from although it was attached to a PCB that was filled with vintage blacks when I purchased it. Maybe it could be useful for a hand wired build? Anyway its free if you want to collect it from Newcastle upon tyne (UK) or cover postage costs.

Thanks for looking!