This is at Home Depot. Good thing I looked - they have a 1 inch one but it is self-seal - for obvious reasons don't get THAT. And I lied - its actually 6 feet for 2 dollars. Can't go wrong with that price for a sewing notion - hee hee!!!!
Armacell Tubolit 3/4 in. x 6 ft. Polyethylene Pipe Wrap Insulation
Model # OEP07838
Store SKU # 419921
$1.18 /EA-Each