KipKay that explained how to modify a cheap AA flashlight and turn it into a bright Police-type Flashlight for around ten dollars. Though I went slightly over budget, I was able to build nice flashlight for under $20.
(3) - Energizer 123 3V Lithium Batteries ($9.84 for a package of two, you can purchase another individually)
(1) - Krypton KPR112 6V Flashlight Lamp ($1.99)
(12’) - Paracord in your choice of colors (4’ per pass of Turk’s Head)
Glossy Black Spray Paint
Clear Satin Spray Paint
I bored out the dividers inside the flashlight and inserted the batteries, and then I changed out the bulb. To finish it off, I customized my flashlight to suit my own taste.