Numbers of catalog's pages depend on how many pages of category/subcategory your catalog will have plus 1 (only one) page for enlarge photo and more detailed information. No matter, how many items you have for presentation.

Example:
You need the liquor store catalog. You have 1000 items in 3 categories: "Wine", "Vodka", and "Cognac". It will be created only 3 ($25.00 per page) category's pages - where you can place all you products according to their categories - plus 1 ($10.00) page for enlarge photo and more detailed information.

Total amount: $25.00 x 3 + $10.00 = $85.00