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Geofabric 4x250 DeWitt 

DeWitt P4 4'x250' Pro 5 Barrier 5oz Fabric

http://smile.amazon.com/gp/product/B000W6900S?psc=1&redirect=true&ref_=ox_sc_act_title_3&smid=ATVPDKIKX0DER    $120

Pro 5 Barrier is the best bet because it is 5oz (rather than 3oz) and you get 250 feet in a roll.

Brochure:  http://www.dewittcompany.com/pdfs/06_landscape_fabric.pdf 


Here's the 6 foot wide 5oz version...

Dewitt-P6-6-x-250-Pro-5-Weed-Barrier-Landscape-Fabric 5oz

http://smile.amazon.com/Dewitt-6-Feet-250-Feet-5-Ounce-Landscape/dp/B000W690BC?ie=UTF8&psc=1&redirect=true&ref_=ox_sc_act_title_1&smid=ATVPDKIKX0DER    $176.21 + tax
The price is obviously more than the 4' version, but as there are less join overlaps it is a little more efficient.

You can sometimes find it new on eBay at http://www.ebay.com/itm/Dewitt-P6-6-x-250-Pro-5-Weed-Barrier-Landscape-Fabric-5-ounce-weight-/272274097461   6'x250'   $150 + $0 + $0    This is by far the best bet.


For lining the bottom of the footings it is the most efficient to use the 5' wide variant.  On eBay it is $125 instead of $150.