There is a site available on the net called ILive (there are some other similar ones as well but I am not familiar with them), over which you can watch dozens, maybe hundreds, of channels, including a lot of both US and international sports channels, espn 1& 2 (but not 3) included. In order to avail yourself of this service, you are obliged to put up with a LOT of advertising, including some blatantly fraudulent ads ("your flash drive is out of date; in order to continue watching you must update", and, if you do, you open your computer to various trojans, most notably the notorious ("Angel something; I forget the exact name, but it is the one that fills your screen with half-naked Rockettes). I found out the hard way that if you just x out each of these "warnings" as it appears, you can watch the program content without problems (except that here in Guatemala the program often stalls or goes strobe). We actually DID get to watch most of the playoff games; the second half of the NC game was of pretty poor quality, but better than gametracker.
I don't know how ILive works in the US or if there are similar but better alternatives, but you might do some investigating along those lines. We are about to get a new tv package that is supposed to include espn3, so may not be using ILive any more, but would be interested to hear what, if anything, your experience is with it. (Quite probably there are other posters who know much more about this than I, a tech cretin, do.)