if you're good with soldering, you can buy the raw cable and connecters from markertek.com
I think it's something like 32 or 36 cents per foot. right-angle XLR connectors are about 5 bucks each. so for about $30 - $40 you can make your own set of cables, 15 feet, 20 feet, whatever you want.
or if you're not good with soldering, just buy a pair as suggested above.