Have to say I found nowth.
There was supposed to be a shop on Tobago, but as I didn't manage to find it I wouldn't know if it stocked only CDs or vinyl too.
On Barbados we didn't have enough time to wander around.
The closest thing to a record shop I came across was this, on bequia, of course it was closed !
Bequia music fest should be on again, at Bequia beach hotel on sat. afto some bands should play traditional reggae - at least they did 2 years ago. Quite a good vibe in town that weekend
https://bequiatourism.com/bequiamusicfest/
where exactly you headin' ian ?