The Hamburg Immigration lists are online at ancestry. Steve Morse has created a one-step form to access those lists. It's the next-to-last item in the
"Other Ports" section of Steve's website.
One of the advantages of it over using the ancestry site directly is that you don't have to know as much German. Ancestry has dropdown lists for gender, marital status, and relation, all of which are in German. Those same dropdown
lists on Steve's site are all in English.