We use the NFLS-X3 series LED strip from SuperBrightLEDs, connected to the solenoid breakout. It's about $1 a foot. It can be cut into smaller sections. You'll also want one NFLS10-2CPTH solderless pigtail adapter per section. I can't remember whether one comes with a strip -- you'll need to check.
http://www.superbrightleds.com/morei...ht-strip/1440/