For those who use Dow 734 Flowable Sealant for sealing pouches, etc.,
I found a great low-cost source.  For less than $10 for a 3-ounce
tube, new and well in date, check out http://www.skygeek.com/ 

I purchased some and it is the same thing that other suppliers want
more than $20 for.

Don Markl
Sherman, Texas