Hello Alameda,
You probably saw my Own Root Cutt. Setup with the 30 images. I made it up because I had so many faded out Christmas lights left over.

About the heating mat :
Go to Google and search for "heating mat" and you will get a lot of different sites and you will find out where to purchase one. Below the link to my "Own Root Setup" on my web-site.

Here is a link that might be useful: Own Root Cuttings Setup Gallery

I used a heating pad from WalMart. Used it for starting seeds and cuttings and also for melting chocolat in a bowl. Layers of newspaper to adjust heat level on low setting. Not very big though.