I believe Bobcat does actually outsource the tracks from a manufacturing company. I am not 100% on this, but this is what Ive heard. If I were you id try to find out who supply's them and cut out the middleman, Bobcat.
You can also send measurements to a few companies and compare the rubber. Rock and Dirt Mag(heavy equipment mag) has a dozen or so aftermarket track co's that advertise in there. You could check in there too.
You may want to look into a set of turf tracks too. Last I checked ASV was the only companing making them, but that was a year ago. May be different now. They are a great investment.