Oddly enough, it is one of those chemicals you can buy legally, without any special licensing. However, to use it legally will be a whole other matter. It is like a bunch of certain chemicals we use regularly in our business. But when easily and readily combined with other chemicals, it changes the whole "intent" of the use, to another level. Ask me how I know. If those criteria are not met by the regulators guide lines, you will not only get a black eye, but you will give further reasons for the regulators to become more restrictive, giving legitimate users more paper work to fill out, and a closer policing of the industry in general.
As usual, small lots are considerably more costly, than large lots, as was described in the Nitric acid cost variation thread.