Thule XB16 tire chains. 1 pair, size 265. Used a couple times over the course of 2 weeks last year. Worked great on snow/ice! Unfortunately, they don't fit my new tires. Sizing guide:
http://images.amazon.com/media/i3d/01/61kTMuzPtRS.pdf
$80 shipped
http://images.amazon.com/media/i3d/01/61kTMuzPtRS.pdf
$80 shipped