Should you ever feel the need to impress your friends with the number of places you have skied in your life (and not go bankrupt as a result of it) head over to Slovenia. If you settle in the town of Bovec, home of Kanin, the highest ski center in the Slovenian Alps, you can venture out to nearby ski resorts in the neighboring countries: Sella Nevea and Tarvisio in Italy, and at the Arnoldstein in Austria. If you get the 7-day pass, you get two free coupons for skiing in Italy and Austria. The altitude stretches above 2000 meters (6000 feet) and a day pass will set you back less than $20.
Of course, you can ski three countries in one day in Chamonix if you are lucky, too, but it is a lot more expensive (closer to $50/day) and a lot more pretentious.