When trying to obtain the REGIONAL MATERIALS credit we are all used to thinking in the terms of 500 Miles.  However, LEED allows for a "weighted average" to be used if alterative methods of shipping are utilized.  The formula is as follows:

Transport by Rail : Divide the total distance by 3

Transport by Inland Waterway : Divide the total distanceby 2

Transport by Sea : Divide the total distance by 15

So... if you have product that you would love to use, but it is outside the 500 mile radius; see if you can coordinate deliery via rail by communicating with the vendor.  Depending on the product, this might be their standard method anyway.

Altro, a major resilient flooring manufacturer in the healthcare and education markets has just announced that it is removing biocides and antimcrobials from its products.