The problem is this...
Wedding photography is an art. So, many times you are paying for "the eye" of a seasoned professional versus, say, "just a lot of shots" from the average photographer.
Photographers that work for some of the major studio might only make $400 or $500 for a wedding. However, the studio will charge the client maybe $2000 to $4000 for the photographer and the finished album.
Instead of shopping for price, I'd suggest interviewing several photographers, look at their work, as a lot of questions, then compare packages.