These pop up on meritline.com for $10 (with coupon code via email advertisement) every once in a while. Check my post #62. Its a good alternative to a cheap C8, but with greater battery capacity.
The best part: the battery tube screws into the DST head (defiant super thrower).
Check my X7 mod thread for the easiest way to drive MT-G2 at 6A with a high quality host that loves that emitter. Great heat sinking and beam profile.