For one thing, you're talking about a lot of properties -- there are currently around 500 listings in Manhattan that are at or above that price on the market now.
If you have more specific criteria -- say you want to know what sold at that price point in your neighborhood, so you know how to value your home -- you can contact me and I'll run a search for you.
author, "Diary of a Real Estate Rookie"
Insider Real Estate Tips with a Twist of Humor: http://tinyurl.com/2ag28z
Most other area Realtor Boards are pretty accessible by any Realtor. If you need something in Queens or Long Island, I can arrange it for you...Long Island Board of Realtors. Brooklyn has their own board (although LIBOR does carry a lot of Brooklyn listings).
If you don't, you may have to rely on public records. Check to see if your community allows you to search public records on line. If not, a trip to town hall and a small fee should get you there.