There's a Sci-Fi shop in town near to me and they have one that's about 2 foot tall for about 50 quid. You can also get an R2D2 for about the same price.
try mick burne from mansfield, apparently all the big helmet dealers have been kicking up a stick about discounting so he can no longer get stock, hes in mansfield, you could get a good deal as hes selling up
I emailed a few vendors including helmet city and none of them came close for the Fluo Yellow helmet. The plain black was around that sort of price. Happy with the deal I got, the vendor doesnt want paying until I have the helmet & am happy with it. I know most will price match, but if someone gives the best price to start with thats who I wil go with.