Dougs headers, where to buy?

I found mine on Amazon.com for pretty cheap, but had to keep an eye out for a good deal. Just do a google search for the part #. Mine have held up pretty well.

Tom
http://www.amazon.com/dp/B000SSE8HU/?tag=joeychgo-20

$584 shipped.

For the price savings I would just go with Summit, less hassle if there was a problem. Good to know though, never thought to check Amazon...