If you're looking for a budget option?
Keychron V1/V2/Vwhatevertickles your fancy = 64$
Cheap Aliexpress PBT caps = 25$ or so
And you didn't specify if you wanted tactiles or linears so
Tactiles: Haimu whispers
Linear: Haimu Heartbeats
Both cost the same (.30 Cents per switch)
I haven't tried those switches but I've heard good things
Krytox 205g0 =8-15 bucks depending on where you look
Lube the stock stabs, fill it full of foam or polyfill, tape mod it, lube the switches if you're feeling fancy (not sure they need lube)
Boom, very basic, entry level, but it'll work.