I have some heliax for sale.
I have several lenths of:
LDF5-50 with N type connectors on each end. They are about 25 metres long. $100 ono
RG318 with an N-type connector on one end. (RG318 is basically the same as LDF5-50) $50 ono
LCF-78 with N connectors on each end. 40 metres long (new & tested). The ultimate UHF CB coax. $200 ono
http://www.rfsworld.com/RFSglobal/pdfs/specsheet_220245178141070302006110618.pdfAt UHF CB -- 2.54dB per 100 metres compared to RG-213 which is ~15dB per 100m or that of RG59 which is ~35dB per 100m.
I also have several lengths of LDF1-50 and FSJ-150. This is thin heliax about the same diameter as RG-58.
I do not have connectors specifically for it, but RG59 connectors actually work quite well on it with only slight or no modification.
I can also get the corect connectors for it if you intend to use it on frequencies above 2GHz.
(you might like to compare LDF1-50 to RG59 in case you doubt how good this stuff is.)
$1.50 per metre
I also have some FSJ1-75.
This is the heliax equivalent of RG-59 (75 ohms). excellent for making up phasing harnesses or low loss scanner/TV/satellite LNC coax runs.
$1.50