Yes ECOLECO is where I got 25 around 10 years ago. However, I believe they are now out of stock.
While 18 gauge cable is better and the Coleco original cable is ideal. I did find a supplier online that is selling Gold plated 20 gauge shielded DB9 cables that are high quality. The problem is the price is $39.07 for 10 feet and $34.38 each when purchased in QTY’s of 25 or more. You could cut the male end off the cable and wire it directly to the power supply and the female end would connect to the ADAM Memory Consoles male DB9 connector (but the Coleco one is unique and would fit better).
You mentioned that you did not want to do any soldering. For $1.74 and free shipping from China you can purchase a DB9 female solderless terminal board that accepts around 19 gauge wire (remove the two screw terminals when used on the ADAM computer). You then buy 18 gauge wire and make your own cable using UL approved material.
The following 9 conductor 18 gauge speaker wire is similar to what you need, but you need something that is rated for power.
Also the other day I noticed that EBAY now accepts classified ads. You would most likely find more success listing a classified ad on EBAY asking for Coleco ADAM printer cables.
I hope you find what you are looking for. Another option would be to contact a cable supplier like Cables Online or other computer cable company to see if they could make a compatible Coleco ADAM memory console power cable that does not violate any copywrites. If a minimum of 100 cables needs to be made, then I might be interested in splitting the order with you. You buy 50 cables and then I might purchase 50 cables. Might take 3 or more years before the cables and power supplies are sold.
Edited by HDTV1080P, Fri Sep 14, 2018 9:44 PM.