In July 2007 Green Mountain was selling a pair of inner rockers on Ebay for $289.
In 1996 I paid Green Mountain $195 each for inner rockers and $120 each for outer 2 door rockers. All were 16 gage.
Yes, there were the best at the time. There is a fellow on HAMB who is now fabricating them along with floor pans. Excellent quality.
Townsend Customs & Hot Rods out of Riverside CA makes the really good stuff for 49 thru 51 Mercs now. He goes by slddnmatt on the HAMB. He even adds the lightening holes for the outer rockers if you want.