Answer:
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you can get pretty much any thing in America if you have the money heres how to get a grenade Go to Sturmgewiers NFA Board and put a want to buy! WTB, but don't do it unless your ducts in a row, or they will black ball you and think your a kid, Remember you are asking for a Legal Sale and you must be at least 21 and you will go through a bunch of background checks and so on, is it really worth it?. $200 tax stamp plus the price of the 40mm Grenade, then you need a launcher another $200 tax stamp plus the price of the launcher!
You can have anything you want in this country Legally if you have money! I passed up a RPG with 2 rockets for $8500.00 which is a smoking deal, the last Trasferable RPG I saw was pushing $18,000, and these are not replicas or Demilled junk, these are registered with the NFA branch of the ATF!