Thunder B CO2 Sound Grenades in different shapes and sizes, together with the accessories are now available at Mach1 Airsoft in Canada. You can avail of these in packages of 3 and 12 pieces so you can save more than getting just one piece at a time... "Thunder B Sound Grenades. For when you want to say hello, goodbye, and everything in between."
A new version Thunder Sound Grenades now being distributed by Valken Tactical can now be found at Airsoft Atlanta... "The Valken Tactical Thunder V Small Multi-Grenade Package Starter Kit. Everything you need, besides CO2 cartridges, to get started. Includes one single main Core kit + 3 Cylinder Multi-style Shells (C, B, and Pineapple grenades).