I'd check locally in one of your electronic parts shops I buy any I need form my local shops they just cut it off a roll.
Source for Shrink Tubing?
I terminated several pairs of speaker cables with banana connectors and want to add shrink tubing at the union of the connectors and cable. I am looking for 3:1 shrink tubing in both black and red in 1/2" diameter. I figure 3' of it would meet my needs. I found a few sellers on-line, but either they require a minimum dollar purchase or the smallest quantity they offer is far more than my need. Can somebody recommend a source for such a small quantity? Thanks very much.