I just love discovering micros I had never heard of before and, well, the Interact Home Computer is definitely one of the more obscure ones I have ever encountered. It was, according to Wikipedia, manufactured by Interact Co. of Ann Arbor MI and only a few thousand were sold, thus making it a highly sought-after rarity. The micro came with 8k of expandable RAM, an Intel 8080 CPU, a built-in cassette recorder and keyboard, joystick ports and some rudimentary audiovisual capabilities. You can find out more about it over at Old-Computers.com.
Now, if you have a few thousand dollars to spend on vintage tech you could actually buy this boxed Interact Home Computer that appeared on eBay. It is in great working condition and comes complete in its box with two joysticks, the manuals and a ton of tapes. Seller ships worldwide.