Jaymen,
I know there used to be a guy that sold the for about $200 each, but since the economy took a dump, I don't think they sell them anymore.
I have a how-to that I did about 8 years ago in the "How-To" section. Cost back then was about $25 each, probably about $30 each now.
Easy to do. I see painters have used them on ebay quite a few times.
No welding involved
Info on the
How-To section here.