Even w/o reponses to this, I post the following updates:

You can get the discount and free shipping with any Nokian tire in any size. If yu are looking for winter tires, or have the new model Prius with 15 inch wheels, you can play too.

The 10-buyers limitation has been lifted. You will get the discount regardless of how many people call 800-576-1009.

Ryan told me he has steel wheels for winter tires, but I don't know if his prices for these lead the market.

I posted Ryan's email wrong before. The correct is

tirefactory AT tirefactory DOT net

Did I mention that I will get squat for doing this? It's just that these seem to be pretty good tires, and I'd hate to see any of my Prius friends driving on worn-out tires. It's too bad, I could use a cut.

DAS