Digi-Key carries a couple of Piezo Polymer Coax cables from TE Connectivity Measurement Specialties.
The part numbers are:
223-1222-ND ( TE part number 1005646-1)
223-1223-ND (TE part number 1005801-1)
Both of these part numbers are available in Continuous Lengths.
As the Digi-Key website states 1 = 1M (meter) for both parts.
This is calling out the Minimum is 1 Meter long. These cables will come on Continuous Strip.
If qty = 10 is entered the Length will be 10 meters long as a Continuous strip.