i would think that just about any breeder that sells their own gear would hook you up on a large bulk buy.. and probably some of the bigger banks as well.. there was one bank i always remember seeing in high times saying that they sell like 500 beans bulk, but i'm drawing a blank on who it was, although i'm kinda sure it was a canadian bank if that helps narrow things down some..
i would never buy that amount of seeds myself though.. i'd rather just do a seed run and only pay for a small amount of beans, and make the rest yourself..
the feds or homeland security or customs may look the other way when they catch a few packs going through the mail, but i would hate to have that package intercepted as i would almost bet the house on the fact that you'd either be getting a lil visit or get put on a very unpleasant list to be on.