Yes there are a few about, it's just a matter of finding them. I have a Tajima one, plastic-coated steel, very good.
I'm actually thinking of buying a box of 80 and selling them on. They are immensely useful - I use one on my SCMS, I need to make another SCMS fence and I also want to make myself a mitring fence for the SCMS, like I made for my neighbour a while back and wrote up for GW.
I'm interested in the Kreg though - I've been quoted more than that for the Tajima even buying a case at a time.
Taj do 1m, 2m and 5m L>R and 3m R>L! I really don't understand. But it certainly is better than trying to use a R>L tape measure. You can do it, but it's a pain because of the cup.
I'm thinking of offering all the other little jiggy bits (sliding nuts, T-nuts, knobs and Bristol levers) too. I have found suppliers, the trouble is tying up hundreds of pounds in stock. The usual story.
I have found a supplier of knobs and Bristol levers - good quality too. I've discovered that the Ax ones have plastic teeth - the only steel bit is the thread itself and the spring. The teeth take the strain, and i've found some that are solid steel - only the lever itself is plastic. Comparable in price, as well.
I've also found a sliding nut substitute, not the fancy engineering of a proper sliding t-nut, but a tenth of the price and more than adequate for my needs.
I think I'm going to have to investigate ZenCart and get myself organized!
EDIT - Am i right in thinking the Kreg is Imperial only?