Start calling
http://www.sternpinball.com/find-a-retailer/?zip=&state=&country=United+States
I'd start with
Game Exchange of Colorado 303-893-4300
CoinTaker.com 570-847-6366
Looks like Automated has one listed on ebay... try calling them for the best deal
ebay.com link: STAR TREK VENGEANCE Premium Pinball Machine by STERN IN STOCK BRAND NEW
Automated Services www.pinballs.com 203-877-0348