Search:

Here:
http://www.ebay.com/itm/Adhesive-Tie-Off-Loops-w-Grommet-Great-for-Tyvek-Sheets-/200642194321?pt=LH_DefaultDomain_0&hash=item2eb734eb91

I'm not a fan of tape, if it can be avoided. It makes that section of your project stiff and unyielding. I prefer stitching in low stress areas.

There's a guy on ebay that sells Tyvek by the foot....