Recs on Where to find heat tape and supplies?

Having someone make 3 racks of 7 cb70 height racks for me....have been looking around, but wondering if anyone has a good rec for one could find heat tape, supplies, cord to finish the heat tape and transition into cord plug in for helix use? ty for any recs and help:)

http://www.reptilebasics.com/ sells it and assembles (cuts & wires) free of charge :)

i got my flexwatt from Cornel's World. they're located in Canada, though. that was pretty much the deciding factor for me.