Yes, but they're stupid expensive.
It's actually cheaper to go buy a new Arctic cat blast 400 than anything. Then they get real suspension and a track that's capable of taking them off trail.
Get yourself an 800. They are all around better than a 600 on everything except fuel. There's lots of times you're not using all the throttle, but it's there if you're getting bogged down.
People with snowmobile money don't trade them for dirtbikes, because they already have new dirtbikes also.
It's pretty much all over the mid-west to the west coast, you're going to pay $4-6k for a good usable one that's not too old. Expect $10k+ for something less than 5 years old. Add a few $ if it's been turbo'd.
On the upside, if you stick with a new pro or axys chassis Polaris you can get your money out in a few years. I paid $5k for a 14 pro 800 163 2 years ago and got offered $6k for it yesterday.