Our local Home Depots carry it as well...they used to carry the smaller tubes, now all they have is the caulk gun size. Bought some today as a matter of fact!
I concur with the above commenters, Home Depot does carry it, and as a matter of fact, they are cheaper then ordering it online as well. Lowes shows they carry it, but I never found any there. JMHO!
I bought mine locally at Lowes. They keep it with the glues and adhesives at our store. I've also seen it for sale locally at different marinas but they are much higher.
