Our local GC has had the same problems as the major chains, and one supplier has just stopped, so they're struggling more than somewhat...
We were up there the other day for some of those 'French' style outside pot hangers, which you can pop anywhere and grow just about anything, and finished up buying what they called 'Brian's Thing'... It turned out to be a 'Lophospermum', but we're delighted because we have a home for it!
But, the main problem they have, is the supply of compost, peat etc, which has been seriously disrupted! The normal piles of the bags are just not there! That has been a problem for the suppliers as well!
Hopefully, 'late blight' futures accepted, we will live on tomatoes and courgettes and beans, and even Mrs Growster may begin to like courgettes again (we grew too many one year, and she just got fed up with them)...