They may still have some.
You can buy it at SilverPrint in London:
And again: Harman / Ilford is still producing it, or maybe I should better say it has just started producing it again as a new product under the combined Harman / Ilford brand, so it's probably going to stay for a while and should become more widely available I guesse...
However, I think they will be able to supply it, if you ask them to order it from Harman, considering they have the WT developer...
Yes, it's a confusing situation. Maybe it would be better if they all called it "Harman"...:o
And as I told you, the shop I went, had a least a dozen of "Ilford / Harman" Cooltone bottles stocked, acquired recently I think because I can't remember seeing it there before under that brand name...
I still have six boxes for sale if you need some in Canada.
I've no doubt that there are plenty of dealers with stock, and that there will be for quite some time given it's apparent lack of popularity.
Some still listed at the following (via their advert in Black and White Photography magazine):
Have you tried a web search? These were found via google in under 2 minutes: