You have likely seen the tv commercial for Flexseal. It sells for
$19.99 per can, but the commercial says you get a FREE can, (plus
separate shipping and handling). I checked into this on their website.
The S&H is $9.99 per can. Thus, those two cans cost you about $40.

Walmart sells it. $12.99 per can. Thus you'll pay about $26 for two
cans, and save $14 (not to mention the wait time). [Ok, there will
probably be sales tax, but no where near $14].

So much for their "FREE" can.
You can actually get about 3 cans at Walmart for the same price as the
"order by mail", and that allows for the sales tax.

*WHAT A SCAM*