Any way around this problem?

I'm planning on puchasing a Hakkotsu Thunder B grenade from Evike...but don't want to have to pay $25 for a 12 pack of extra shells. Is there any way to use/make my own? Or do I even need to use the shells for it to function properly?

http://www.airsoftpost.com/hakkotsu-thunder-sound-effect-airsoft-paintball-simulation-grenade-p-30107.html

It looks like the device functions by slowly releasing CO2 pressure into the shell when the pin is pulled, and when the pressure becomes critical, the shell ruptures/breaks and makes a loud noise. So you'll need shells, but I don't know if you could make shells any cheaper than they can sell them to you. You'll just need to be aware during ops that this is about $3.50 per use including the initial cost, replacement shells, CO2, and the suggested total replacement after 20 uses.

I was just doing some math today and thought I'd include that one use of this grenade is about equivalent in cost to two hi-cap mags' worth of BB's. So all in all, not entirely unreasonable, but also not something that will only cost money once. Hope that helps.

thats exactly what i was thinking spl!

i hate the fact that you buy a nade launcher, then pay for the shells, thanks for bringing this up