The ridiculously high cost and short shelf life put me off sugru, but looking in to it did lead me to a handy and cheap DIY alternative - clear silicone mixed with corn starch. I don't know how the 'rubbery' property compares to sugru after it sets up, but it worked nicely for my needs.
Its shelf life is advertised as something like 1.5 years if you keep it in the fridge. Just the other day I used some that must be about three years old and it worked fine.
Yes, the short shelf life is what turned me off, too. For my quick repairs I found myself using only a fraction of the smallest packets they sell, leaving the rest to dry out unused. And after needing it a few months later and finding it unusable I never bought anymore.
