It's less than $200. Our 32,000 lb MH was something like $160 when we registered it this Spring.
If you are over 26,000 lbs, you need to get a class E license. There is no test or extra fee, you just self-declare that you drive an RV greater than 26,000 lbs. Basically, just fill out and sign a form.
Roger & Mary
2014 Tiffin Phaeton 36GH
2012 Honda Fit toad