I'm going to assume that the normal price for this bundle is $300 (USD) and with a $50 off promotion at some retailers it actually comes out to be $250. Whatever the MSRP price is, here is what the Xbox 360 Spring Value Bundle includes!

Now apparently, other regions in the world are getting other Spring Value Bundles. Major Nelson says to check out this link (and wait for the bundles to load after the banner goes through some lengthy animation) to see what bundles will be available to you. Those other bundles are slated for release later in March, so check then.