The hardware in that system is from Blackrock Microsystems. You can call them up and buy it right now (if you’ve got the cash...It’s not cheap!) It’s currently intended for research, so you’ll need ethics approval and the decoder isn’t included (but that’s the fun part anyway).

Ripple Neuro sells similar gear (better, even, maybe) and Neuralynx and some smaller companies also have competing products. It’s not in every corner store, but you could have a similar setup this month if you really wanted to.