How about bending your own? With a good wire bender (not too expensive) you can make them with coils, or not, depending on your application.
Check this link:
http://www2.towerhobbies.com/cgi-bin...?&I=LXGFW4&P=7
Info states it will bend wire from 1/8" to 1/4" (3mm-6.5mm) in diameter and will bend coils in wire 1/8" to 3/16" (3mm-4.5mm) in diameter. Should do exactly what you want.