Tom, We will have a 18 month subscription for the price of 12 special at our booth in Oshkosh. This won't be up on the store. But just for you (and other faithful forum followers), if you update your subscription online during the show, then shoot an email to support@adventurepilot.com letting us know you just renewed and would like the show special, I think we could accomodate you.
Thanks!
Walter