Any body notice that its hard to find propylene glycol?

[das]

I use the brand Peak last year and this year my buddy beat me to winterizing his boat and used the same brand as he did last year only to find out that Peak has changed it formula to a ethanol glycol.
This is not the stuff you want in the block of your engine. So people, beware and check the label of the antifreeze you are using.
What brands are others using?