Right now you need to contact Spondoolies directly to get a answer. They will ask you to prrove that you have the place and the $ to buy some. I do think that there is already some SP50 running.
I suspect whenever it is out they have a NDA wrapped around getting one. So most likely have to prove your a serious buyer, and not release price or other information about it unless approved by SP.
Which SP really has no big reason to release a lot of info if they are going after the big fish only. I'm not convinced they have a consumer version yet though.