Hey folks!
Just to close out this thread, I wanted to let you know that I bought 30 meter Starrett Certified Long Tape (530-30CM), listed at $102 (https://www.mcmaster.com/catalog/129/2574/1936A4).
It came with a signed certification letter attesting to it's variance (.83cm in 100m) from stated length, traceable to master standards at the NIST.
Thanks again for your input!
My best,
Tim