The only auction (I can think of) in Virginia that features warmbloods is the one being held every fall at Virginia Tech. From what I've heard you can get some good youngsters at very reasonable prices.
Get in touch with them to see what they have now....
Siegi Belz www.stalleuropa.com
2007 KWPN-NA Breeder of the Year
Dutch Warmbloods Made in the U. S. A.
Tech isn't doing the auction any longer, from what I understand. They have a list of available for sale and everything is in Middleburg at the MARE center.
PAS has a dressage auction in July and you can contact them for owner info and pre visit/vet but after the sale is limited vetting. Last year they did have a vet available for x-rays, etc prior to the sale and on the grounds.