MAC-42

The Aquarius uses the same RF cable and modulators that other vintage systems (like the Atari 2600/7800) use, so if you have those handy, that should be all you need. The RF output on the Aquarius is generally very good, with a good cable.

An AtariAge member is offering a complete Aquarius system with Mini Expander and hand controllers for $45 shipped in the Marketplace:

http://atariage.com/forums/topic/225284-aquarius-computer-with-mini-expander/

That's an even better deal than the eBay one, IMHO, since you get a Mini Expander and controllers with it.

Aw nuts. I bought the ebay one for $25 shipped. LOL. A little too late getting your suggestion jaybird3rd.