Ancestry.com is offering limited-time free access to selected Immigration records, March 14-17. The offers includes Ship’s Passenger Lists and Border Crossings & Passports.
It’s a pretty sweet deal, even if you already have an Ancestry account but not the world-wide version. Mine is currently U.S. only, and I just realized that I can access those few records that I currently need, without upgrading.
In order to see the free records, you do have to create a free guest account.