Plenty of sprays available in the UK too

Testors Dullcote 1260T is my personal preference but pretty much anything with "clear matt varnish spray" on it from a hobby shop will do the job
A tin of spray is cheaper but the postage is high as it can't go through royal mail, so you end up spending the same as you would on a stick.
I average 10 decks out of one can, I've no idea how many decks an easy rough stick can do as I always lose it before it runs out.
Certainly a lot more than 10 though
I've got some easy rough in stock if you're interested