I found this set of 'Nail Art Brushes' in Home Bargains (
UK cheap shop).
It's a set of 6 brushes and a 'Dotting Pen' a kinda round ended scriber, I used it to score some plasticard and it made a light indentation.
They are obviously cheap brushes but the two flat ones would do for dry brushing. I haven't used them yet but this set would certainly do for terrain and basing and save using decent brushes.
They also come in a lovely shade of pink!