Tickets can still be had for the 2010 Final Four in Indianapolis, you just need to know where to look. Here are some places to get individual game tickets, all-session passes, and complete travel packages.
All-Session, Semifinals, Finals tickets. The "official" provider of hospitality packages.
+ also, you can sell tickets to the games as part of the "Fan2Fan Experience"
VIP Final Four Packages (including hotel)
Individual tickets & packages. Some good low-end seats/prices.
Hard to get tickets up close, though pricey, and more.
Ebay.com - search for "Final Four"
Lucas Oil Stadium