Thanks blinde_Q I'll check those stores.
If I had the Alps tact switch part number I could search for matching caps. The closest I've got so far is from another thread https://www.psymusic.co.uk/for…s-for-access-virus.66630/ but the part number mentioned "Alps Skhcac" doesn't seem to be a valid Alps part number.
I was hoping access might be able to help either with spare stock or the part number.