I went into a well known Maldon Chandlery (that advertise themselves as classic boat specialists) today to get a 10mm galvanised nut and washer. Asked where I might find them,
'Over there somewhere if we've got one'. Mmm, not very helpful!
They didn't.
Loads of 10mm bolts of different types and lengths though.
'Are you going to get some in soon?'
'Not unless someone orders them'.
'So you've got bolts, but no nuts & washers to go with them'
'We're trying to get rid of the loose cumbersome stuff'.

Standby for more overpriced little plastics bags hung up on pegboard.