Set of Wild Country Helium Friends retail at £150. These are brand new still with the tags on. I never got round to using this set as had some DMM cams which I use instead and lost the reciept, doh! Excellent cam, amazingly light and go for £50 each cam on ebay. Full set for £125. Sizes are 0.5, 1.5 and 2.5- a good range. Info can be on cotswoldoutdoor search for helium friends
Here is my gumtree ad, which have them listed for £130, but will sell on here for £120.