Might be worth giving these guys a try, local to me, great shop.
http://www.toolite.org.uk/charnwood-sd26-diameter-with-centre-hole-80grit-pack-p-56391.html axminster are after three quid each.
Five for twelve quid. I have bought the ones without the hole in the middle as well.
A fabulous shop. Mitcheldean, Forest of dean.
Three storeys of quality tools, tightly rammed in, corridors about two foot wide and the young oik on the counter knows where everything is.
Leave your credit card at home. Well worth a visit.
Best tool shop I have visited and family owned.
Chunko'.
Oh! and next door is Forest of Dean Fasteners, they sell fasteners, nuts, bolts, etc etc etc very handy.