I was thinking 636 was still available these days. But after searching the web to see if it could actually still be purchased somewhere/anywhere turned up no results, I guess it really is gone for good.
About the only current thing I found on the web for the 636 was a bunch of it's past MSDS PDF sheets. And some old info about it being reformulated somewhere around 2000-2001 (if I'm reading the web info correctly) and that the original "636" name was changed to "636 Plus" after reformulating the recipe. Couldn't find what year the reformulated 636 was finally axed.
my youtube page.