I don't really know where they are, I've just been playing with my 30 year old season and continuing that until 2004 stuff comes out!
You could try..
http://www.baseballsimcentral.com they have a lot of roster packs there.
I know for sure there was one as up to date as the All-star break. I used that for a while.
In the coming weeks, there will be several new 2004 ones. Looking forward to CBLCardinals rosters.