Federal Explosives License is required for personal or corporate sale. Have fun with that! Hope you like jumping thru hoops.
Not only jumping through hoops, but the storage requirements for the devices once you have a FEL is intense and can't be stored in most residential locations but have to be stored off site in approved zoned locations in approved explosives storage magazines ($17,000 and up for small ones, unless you only plan on storing a small number of them in a smaller type 2 box.. even then they are multiple $1000's).