http://global.dymo.com/enUS/Categories/RhinoPRO_Printers.html

I just stumbled on the link above.  They make heat shrink tubing for the
Dymo label makers.  .25 - 1" I think.  3:1 shrink and the labeler will print
on the heatshrink prior to use.  Label cartridges were not that expensive
and had a modest supply of label material.  Looked like most were black on
white or black on yellow.

Requires the RhinoPro printer series and you'd need a model 5000 to print on
the larger shrink material.

Figured I'd share :)

Alan