Radio shack carried it when I bought my last roll... Under the name of Pro Wick... Although for belts I use surgical tape or aluminum foil tape, I use it all the time for way more than removing solder... It's "must have" in the scratch-builder's tool box IMHO..
BTW, a shameless plug... That Reader Tip on pg 55, the last one? About the foil from tea-lights?
Yupper, that's me...