Though for $139, I would actually be better off (all else being equal - which probably isn't actually the case because I'm sure the megalennium is a much nicer host), grabbing an RL-2088 (less cost) and removing whatever LED it came with.
What if I dropped my parallel requirement and just sought the short body style, but not necessarily just in parallel ?
This is another host for 3 parallel 18650 but still way more expensive than OP requirements of possibly $20. This is 2 parallel 18650 but again, much more than what OP wants to spend.