I consider Nitenumen to be “upper end of budget” so $38 is just a little high. For less than that you can get a Rofis TR18, or for around the same price a Nitecore HC33, HC30 or Rofis TR20, and for a little more a Rofis R1. (all w/coupon code)
Also right now there’s a $29.99 coupon deal for both the Rofis TR10 and Skilhunt H03.
And the convoy 18350 tube fits the H03.
EDIT: Astrolux S1 tube, not Convoy,
H02 confirmed here: Short 18350 tube for Skilhunt H02 and H02R: are you interested?
H03 confirmed here: (post #12) Lightest 18350 flashlight? - #12 by ZozzV6