Emailed them, just got a reply. Talkative fellow... He talked about Sandy, trip to the Keys, etc $610 per window and $200-$350 shipping per window. I would post the email but cant do it from my phone. If someone wants to post their email or pm it, i will forward the email so they can post it.
I still think a 9/32 router bit, 3/4" Starboard and some safety glass would make up some pretty nice sliders...