Bought a pack from TE:
http://www.teamestrogen.com/products.asp?pID=1982

***BRIGHT***

I'm lovin' this stuff! Much brighter than the stickers (lime green, came on a sheet with shapes pre-cut, dunno the brand) I already had on my bike. Even tiny pieces are still reflective enough to stand out.

The adhesive is peachy, seems to stick well to a variety of materials: hard plastic fender, rubbery mud flap, metal cable hanger, Ortlieb pannier.

The tape itself is a woven/fabricky stuff, that flexes nicely. It has stayed on my pannier fabric just fine.