It's cool to see Chris Staecker's channel getting some love, he brings a a kind of joy I miss from the old internet. I know it's still around, but it certainly feels more difficult to find and suppressed in many ways.

Reproductions are still produced, see the wikipedia page.

3D print your own: https://www.thingiverse.com/thing:1477209

This reminds me, a CNC wire bender is on my list.

I had a CARDIAC when I was young.

Still got it? Would be pretty neat to bust out of the attic ..

Well.... https://www.instructables.com/CARDIAC-CARDboard-Illustrative...

Wait til you see the DigiComp II! It has flip-flops driven by marbles and gravity. Truly astounding.

Really cool! Will we ever construct Babbage's Analytical Engine?

I had one! One of my favorite possessions in elementary school. It came with a nice booklet introducing the theory. Because I studied that booklet, I was probably the only brat in my 2nd grade who knew about number bases. I entertained myself by converting decimal numbers into binary.