The navicore or way-whatever-finder(?) site doesn't show a price... but I would guess $150.00 (US) for 3 years... it appears it will be "subscription" based instead of something you purchase. (NOTE: My guess is based on the UK site which shows 68 British pounds for a 3 year subscription.)

They also claim that if you own the Navkit 2007 for OS2007 that the license number will get you the same functionality. (But the question then would be: For how long?)

EDIT: I would HOPE that regardless of how you obtain the license that it would allow the software itself to never expire... but you wouldn't get updates unless you renew the subscription.