Just wondering about the manufacturing costs of flashlights…!! 
from cheap flashlights to the pricier ones… Any ideas?!
Depends on how many they make.
It is quite a general question - you mean only material and assembly costs, or also R&D, marketing, warranty and distribution costs?
A wildly inaccurate but useful rule of thumb is that each level of distribution doubles the price of an object. Large retailers have largely cut out the middlemen (distributors) and buy from the manufacturer. So if you pay $20 for a Walmart flashlight, Walmart paid the manufacturer ~$10, and the manufacturer spent ~1/2 that manufacturing it, or $5. Amazon, Walmart, and AliExpress have shaved margins even tighter, especially on low-end products. It’s possible a $10 light bought from the manufacturer cost $6 or more to manufacture.
This is just a rule of thumb used for planning purposes, so that light could cost from $1-$15 to manufacture.
so I guess then a $50-$60 flashlight costs $20-$25 to manufacture? so roughly ⅓ to ½ the price even for a $100 and higher ones?
Yes, that’s a good estimate, especially for electronics like flashlights. Designer stuff, you’re looking at much higher margins, but that’s not usually applicable to flashlights.
I think the profit margin is / can be much larger.
Look at the Nitecore TINI for example.
Even the TIP was expensive, but the TINI is much cheaper to make.