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Not that I've ever found. I've shared with other people but these days I tend to buy small packs from resellers on ebay to supplement the huge amount of less popular sizes/grits I already have.
If you're buying it on a roll just get 1 roll each of the main grits, 80, 150, 240. Which type you are buying is a minefield anyway.
I don't normally use Axminster but they have a big range. :-
https://www.axminstertools.com/instantsearch/result/?q=sandpaper%20rolls
Probably the best thread for this, I need to stock up on sandpaper (for use on wood, not metal) across the different grits, is there a recommended bulk buy option?