sticker is $16 and is good until august of the year it's purchased in
so, if you buy the 2012 one, it's only good for half a year, which, I had a close scrape with a federal warden today who let me off with a warning, so, I'll be going to get mine tomorrow, but, yeah, you'll want one.
As far as a trip to OKC or Altus, either one's about the same really...the trip to OKC would be one I'd have to plan well in advance, because of fuel budgeting, Altus isn't THAT much closer to me than OKC though....only 100 miles closer...(which, is about 1/3rd of a tank?) The fuel isn't really the big problem, it's getting work to give me more than 2 days off in a row....