I'm very impressed by this stuff and have just found a remarkably cheap source if you're prepared to pay £20 including postage for a litre. It'll probably last you a lifetime but given that a tiny little bottle costs about £7 it's worth forking out for. Pm me and I'll pass on a phone number and a name rather than post it on here. I'm not associated with him in any way apart for just having bought a litre. I hope I haven't contravened any Cyclechat rules but I'm sure if I have you'll soon let mee know.