I use pulex hard rubbers, buy 36" x 100 wen I get them, bought me last batch from corwoods @ 2.16 a piece plus vat
Usually get them from wcw, but needed resin quick so got them as well and looking at the prices for the razor red ones in link there not much in it as far as cost goes.
I may give them a little try and pick a pack of 10 up