I know Kenetrek boot prices are scary. But I will never own anything other than Kenetrek......ever. You can sign up on dvor.com and they will send you e-mails daily of what sales events they have currently.
www.dvor.com
I just bought a pair of Mountain Extreme 400 gram thinsulate for $325 on the above link. This event has been going for awhile, so they might not have you size now. Give them a try!
They have a Kenetrek sale 4 or 5 times a year. If the sales event you are looking for doesn't appear in their e-mail, just "search" what you're looking for in their search bar.
I'm now on my fourth pair of Kenetreks. I wear the non-insulated Mountain Extreme every day in the summer, and wear the 400 gram Mountain Extremes for elk hunting. I'll never look back. Also, as scary as the retail prices are, they are worth every penny!
Good luck!