IDK how fast you can get them from online sources w/o paying huge for the shipping. I guess you have already done a search for the too. I will try to find some of mine but as they are in my garage, I refuse to promise I can find them. I know I have several calibers of regular blanks out there and some actual grenade launching blanks as well as a case of inert training grenades of Israeli make but all I know where to find is the grenades themselves and you seem to have that already. For those who don't know, grenade launching blanks will launch a trainer farther than you really want it to go. I learned that the hard way too.