Best bang for the buck seems to be hobbycity/hobbyking.
http://hobbyking.com/hobbycity/stor...ight+Flying+Accs.&idCategory=280&ParentCat=58
I use them for lighting up my planes for night flying.
are you HIDPlanet gearbox?
Depending on how bright you want them, UltraLEDS do 120 LED's per metre versions. More expensive but more light per metre.
http://www.ultraleds.co.uk/self-adhesive-cool-white-leds-metre-1041-lumen-p-2017.html