When these Unich first came out, there was a guy on another site offering something like a 50% discount. I’ve had it over a year now and like it so much that when I want to lighten the tool burden for a short ride, I leave the CO2 behind. Fits into a jersey pocket with about a cm sticking out. I can pump a 23 or 25 c tire to about 90 psi without too much of a workout.
BTW, I’ve had enough rides with flats > CO2 supply that I carry a pump now.
https://www.amazon.com/DUAL-HP-S-OR-.../dp/B00EC0CWAU