I've just spent an equally fruitless search until I found your post - the link provided in an earlier post no longer has any available and seems not be expecting any more to become available either :-( I too am absolutely disgusted and have followed your advice and sent P&G the following email using the 'contact us' section of their website:
"Why have you discontinued the Braun hotbrush, an extremely popular best selling product and one that I have relied on for around 30 years. I have lost count of how many I have purchased and had purchased for me over the years. Each time one fails to work, after about 2 or 3 years, I've replaced with the same or similar model. Your competitiors just never got it right, and still don't, which is why I've remained loyal and recommended my friends, colleagues and relations do the same. My current model is now on its last legs and, despite the gas refills being readily available in all good shops everywhere, I can't find a replacement hotbrush anywhere. Why have you done this? My only option is to change to an extremely inferior brand that just won't deliver the same service that I've relied on for all of my adult years. Along with many others in the same situation as me, and not just in the UK, I am so disgusted at having to do this that I very much doubt I will ever purchase another Braun product and will encourage others to do likewise. If by any chance there are any left for purchase anywhere in the world, please advise me of their whereabouts and I'll buy enough to last me for the rest of my hair caring life."
I'll post any response I get here so that others will also know what's going on. In the meantime, would all others as hopping mad as me please take the time to contact P&G about this - it may work. But, if anyone knows of an alternative, albeit inferior product that uses the Braun gas refills please respond as I have a whole stack of them!