You could try cruisecompete.com for quotes. Plug in your dates and several agencies will respond. So

How we use your email Fodor's may use your e-mail address to send you relevant information on site updates, account changes, and offers. For more information about your privacy and protection, please review our full Privacy Policy .
deedee: a great cruise..a few tips, we took it two years ago..excursions are stratospheric..do Mendenhall Glacier just north Of Juneau, on your own. Simply hop the local bus at the terminal, get off at the last stop, see the dramatic glacier sites and museum, take the frequent bus back...cost about $5.
You can stroll Juneau (State House, etc.) easily in about an hour...get a AAA guide book and it tells all you'd ever want to know. The "touristy" Red Dog saloon in town is a fun place for lunch. global impact travel The "tourist" police will not arrest you!
In Sitka, do it on your own (there is a "tender" to the port)..walking to the beautiful totem path in the totem park, about 20 minutes...take the bus back to center of town which stops at the Bird "Hospital"Refuge where you could get off for a visit..take in the Russian dancing show (all female, colorful and well done) right at the port, have lunch in town, and back to the tender. Russian dancers, about $10.
Ketchikan..do it all on your own...dock is right in town..walk to Creek Street, very picturesque, take the elevator up to next level for some more totem pole scenes, stop in for lunch at one of the cafes nearby.
Suggest you skip Victoria...you won't have much time to take the bus into town and back to the ship but if you haven't been there it might be worth it to you. We had been there twice including Butchart Gardens..and it was freezing cold in August..so we stayed on the ship.
You could try cruisecompete.com for quotes. Plug in your dates and several agencies will respond. Sometimes the rates will all be similar but some agencies might offer perks such as OBC, wine, dinner in specialty restaurant, etc. Good luck!
Why ruin your cruise by stressing a "Deal". Best to choose and take a cruise and not look back. Looking for deals overlooks the pleasure of it all. Best "deals" save a few bucks at best, and may have hidden traps.