Spinntex (or Spinn for short) and Polymax and other brands used for making spinnaker sails are types of polyester ripstop and are sold by a variety of sail and kite builder retailers.
Thru-Hiker sometimes carries high quality poly ripstop.
Mountain Laurel Designs uses a fabric called Spintex EXP which they tested as being the best of 75 spinn fabrics they field tested; but I don't know where to buy it... I'd be interested in knowing too!
PS - Just made a small diamond tarp out of this. I plan to use it as a regular light duty tarp. I'm in Southern California and we don't get a lot of rain, so I mainly need a tarp for shade and to keep some of the morning dew at bay...
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