i wouldn't recommend buying one, as it really is just a novelty. I would buy the microcontroller and flash it yourself. I am unsure if crypto cloaks makes a case for it, but it definitely doesn't need a case or fan to hash.

I think an s9 is a more practical approach to home mining, whereas the nerdminer is more of a novelty desk piece (while still hashing).

with nerdminer you will be solo hashing and not part of a pool. the github repo has a good writeup.