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I realize that the OP found what he needed, but in case this helps anyone else ...
A few months ago, I replenished my inventory of 3:1 adhesive backed heat shrink from the folks below.
I ordered quite a bit, but I believe their minimum quantity is consistent with your needs (i.e. 3 feet of red and 3 feet of black), and priced far better for a specialty item like this than most outlets (3:1 is not that readily available).
They delivered exactly as advertised: http://www.ntepartsdirect.com/
Thom @ Galibier Design