You can buy kits there which are similar to OP. I have not purchased any, but many times have had them in my cart :)
I heard some of the samples - they sound awesome! Kudos!! A job well done!!
My first thought - where can I get one?? And second one - how do I save the sound / output it to my Mac?
Fab project!!
Looks like you source the components and build it yourself.
> And second one - how do I save the sound / output it to my Mac?
It has an audio out port, so you should be able to run an 1/8" TS cable from the audio out port into your computer's microphone input. If your Mac doesn't have a mic input, you'll need to get an audio interface. There are many many audio interfaces out there, but a Focusrite Scarlett Solo is a good starter one.
If you're interested in dabbling in analog synthesizers but don't want to break out the soldering iron, then something like a Korg Volca Bass might be a better way to start.
Chris (Sound Lab owner)