Where to buy special plastic epoxy for ThermoQuad fuel bowl?

I discovered that JB Weld plastic epoxies do not stand up to ethanol.

Miller Stephenson MS 907, Manley's "Miracle Seal" and Marine Tex's "Seals All" are all supposed to withstand ethanol. I would like to buy any of those three brands, but can't find any retail outlets, and my inquiries to these companies have gone unanswered.

Would anybody know of a retail source for any of these three epoxies? Thanks a lot.