The U.S. Copyright Office increased basic registration fees to $45 per application effective July 1, 2006. Fees that changed include registrations for photographs (Form VA and Short Form VA), registrations for writings (Form TX and Short Form TX), document recordation, and supplementary registration. Any request received in the U.S. Copyright Office on or after July 1, 2006, for a service whose fee increased on that date must be accompanied by the new fee.
You get a bigger bang for your buck when you bulk register your unpublished photographs. The fee is still a bargain considering what it can do for you in the long run. So don't let it stop you from registering your work today.
Take my advice; get professional help.