I’ve made my XP-E C8’s in red and green and as is so often the case I now want moooooar!
There seems to be a shortage of larger headed DIY hosts - I’m talking Jacob A60 / Trustfire X9 size, 50mm head or larger, and with a deep and smooth reflector.
Single cell empty host with a bigger head than a C8... don't think such a thing exists. You'll either have to use complete lights and strip them, or scale back your size requirements.
$10 for UF C10, but that's just a C8 with different styling. http://www.fasttech.com/p/1562702
Anything bigger than that is at least double the money.