I was just on Onlinemetals.com buying some stuff Al when a $5 off shipping coupon popped up. But after clicking around, it was gone when I started the payment process. A Coupon Code box was at the bottom of the screen next to the Next button, so on a whim, I googled "onlinemetals coupon" and up came a lot of sites. I clicked on the first one and it gave me a 20% off coupon code that worked.
http://www.retailmenot.com/view/onlinemetals.com
Never done that before. Helpful.