Apart from the need to buy by the reel (100,500,1000  ... feet) some of
these would probably suit.
>From $US0.20c/foot (x 1000 feet)

https://www.digikey.com/products/en/cables-wires/coaxial-cables-rf/475?FV=
=3Dffe001db&quantity=3D0&ColumnSort=3D1000011&page=3D1&k=3Dminiature+coax&p=
ageSize=3D25


              Russell



>
>
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