Don't know how long these have been offered on eBay, but the price for these Vision Carb Manifolds is fair, and there are multiple sets available. They're K&L items (11-4880), so they're quality aftermarket units made in Japan. Free shipping in the US.
When's a good time to buy new Vision Carb Manifolds? When you see them!
(http://www.ebay.com/itm/182389271434)
Good find on those. I had a set in the box for several years and installed them when I did my carb conversion. One less thing to worry about.