Ultrafire (Poppas) W-878 18650/26650/3AAA/4AAA (I tested 4AAA) zoomer which runs around $9 (quick search example on Ebay). Only issue might be finding one with a solid pill and some dropped the 26650 ability (slightly smaller diameter). Very wide flood. Mine is direct-drive on high. Have to buy the 4AAA carrier elsewhere (FastTech has it). Driver is either 17mm or 20mm (check the review on the Poppas W-878).
-Garry