From the MSNBC link.
Investigators also discovered some 300 .22 caliber shells in the man’s van that are the same caliber as the casings found in Lefkow’s home, the Tribune reported.
WOW! That's about $6 worth of ammo.
HOW DID HE COME ACROSS THAT?!?!?! /sarc
He was either really determined to commit suicide or he was planning hundreds of murders. Those, of course, are the only reasons for anyone having that much ammunition.