Hi Melissa
I have found that the Locksmith app does work for me.
Basically you do have to password protect each page, but as long as you make sure the password is the same, once the customer has put in the password they don't have to re-enter it. So once they are in, they are in and you can still have your products divided into a section and running on a menu.
They are also very helpful there, so if you haven't already perhaps you could try contacting them about your particular website.
Hope you get a solution! There is always one eventually :-))
Ellen