I've got these from Tracks Plus.  I feel they have much better floatation then Grousers and weigh a lot less then Grousers.   Cost a lot less too.  They can be rebuilt by simply replacing the bolt and the linkage.

They can be gotten for 12-16.5 tires too.  You will probably need spacers on your wheels.  Some rims can be reversed but then the valve stems are on the inside.

These aren't too bad to put on since they weigh less.

Northern Tool sells them too, not sure on price.

Mine are on 10-16.5 tires and I sure love them.  I'd never buy any other brand.

http://www.ebay.com/itm/NEW-OVER-THE-TIRE-STEEL-12-SKID-STEER-TRACK-FOR-BOBCAT-CASE-DEERE-MORE-/330689185562?pt=BI_Heavy_Equipment_Parts&hash=item4cfe9c871a