another thing you may also find in more remote areas (& cheaper).... is
metal plumbing strapping... it comes in a roll... you cut it to length...
put a bolt & nut on the ends......through holes all along it's length...
worked real well for me once after knocking my muffler loose on a really
wash-boarded way back road. heck it stayed on another 10k until I replace
the muffler. Still carry the extra and a few bolts.

Orginal message:
Date:    Fri, 3 Jun 2005 07:57:41 -0700
From:    Art McGinn <ajmcginn@EARTHLINK.NET>
Subject: muffler straps

    go to a hardware store and buy three very oversize
stainless-steel straps with the little worm-screw tightening device on
the end, the type used to secure rubber hoses. they should secure
your muffler for a reasonable period of time. art, '82 westy