Flight to Amsterdam remain historically low for this time of year. From the NYC area, direct round trips are around $530. For those who want to spend time outside of Amsterdam, you may want to consider a flight to Cologne, Germany, which are atround $419 now. You then take a train from there to Eindhoven. This should be booked in advance for the best price. You can find out more about the train at bahn.de.
Hotel prices in Amsterdam continue to fall. Try Priceline, and put in $80 total for the night for a 5 star. Some have reported success at this level. Remember they add taxes to your bid so consider this when bidding, and bid low.
Recent confirmed reports show tourists getting some truly amazing hotel room rate deals in Amsterdam. All rates listed here do not include taxes (10-15%). The world famous Grand Krasnapolski can be gotten for $100 a night. Normally, this spectacular hotel and location are at least 3 times this amount. Other well known and quality hotels available are the NH Schiller, $88/night, Hilton $130, Movenpick $95 ( a little out of the way, but just a little, and fantastic harbor views). The Kras is a 5 star facility so I would start there. These rates coupled with lower airfares starting next week, for example from NYC, a fare of $567 round trip is offered on US Airways, make for a great winter break fun weekend in Amsterdam this month.