A standard Armytek Predator 2.5 (non Pro version) is within reach at that price. The Predator is the best throwing single 18650 light that can still fit in your pocket.
Check out Mountain Electronics and look for Super XinTD C8 V4 18650 Flashlight. You can chose your modes, power level, and tint (as well as de-dome). If you want your father to go "WOW" get the highest amperage and de-dome option. Over 100k in throw from a pocket size customized XM-L2 light that will set you back about $55.00. Keep in mind that you need to run high output batteries like the SamSung 20r's they are recommending and also sell, flat top as well as button top (the only dealer I know of that sells button top SamSung 20r's). They are out of stock of the light right now, but if you email Richard (owner, modder) he'll contact you when he's made more. I would like to add that Richard is one the best vendor's you will ever deal with.
Edit: He now has the new SamSung 25r's flat and button top.
Whats the difference between pro and non pro? I also kinda like how the Viking has a slightly wider beam from what I saw on YouTube videos .
Out of the four flashlights predator, Viking, Pro or non pro. Which one would you guys buy?
I have plenty of batteries for him to use (18650) but yeah I definitely don't want to go any higher than $120