eBay, numerous bike shops can probably direct you to places that sell salvage bikes. If you are in Chesapeake, there are two salvage yards that I've seen addresses for in the Norfolk area. Do a search on motorcycle salvage yards in Viriginia on Google and you'll get good starting points.
Forgive this, but doesn't anyone do research anymore?
Also look at the local and regional racing groups. CCS and WERA in this area. Almost always someone selling track prepped bikes. Prices vary. All depends on what you are looking for and how much you are willing to travel and spend to pick up a track bike. I'm building my track bike from scratch and eBay has been my primary source of parts (and ultimately the salvage yards selling them).