Looking all around the marketplace, I came to believe that tumbled travertine pavers are the best, and ideal, option for individuals looking for porous pavers. They are 100% natural and naturally absorb excess water due to their porosity. Moreover they look incredibly beautiful.

Pricewise, you could locate tumbled travertine pavers for $2.49 per square foot and up. Here is a link with prices and product details: http://TravertineMart.com/pavers.php

I have had my deck for 2 years now and am extremely happy with both the visual appeal and functionality. In addition everyone who sees our deck and driveway goes crazy about it.

Good luck.

Geopave is ideal for a gravel driveway. See http://www.reynoldspkg.com/alcoa-geo/en/solutions/geopave.asp for more information.

I recently received a quote for a I have a client in Chevy Chase Maryland that was interested in using a porous paver to construct a 150 ft long gravel driveway that is 12 feet wide.

ACF Enviromental at http://www.acfenvironmental.com/porouspavement.html recommended a new product called GeoPave, instead of the Geoblock system, which is more suitable for a topsoil/vegetated solution. Eric Wolf of ACF quoted about $2.84 per square foot.

The dimemnsions of the geopavers are about 20"x 40" x 2". By the time you add the cost of the geopavers, clips to secure them and geotex to retard weed growth, you're looking at slightly over $6,000 not including freight.

Some counties offer a grant or credit for these kinds of projects since they are environmental friendly and limit stormwater runoff. That could decrease tne cost so give your county or city a call.

To get prices for porous pavers systems in other regions of the U.S. see http://www.acfenvironmental.com/contactACF.html

Good luck.