It depend what kind and what size of album they offer you, for single image per page is range from $45 to $80, according to size, usually.
for magazine style layout, can range from $15~$45 per single image, even a same image use more then once, will charge as per use, means same image use three times, is charge at 3 times.
This is where bridal shop make their money from, they are very good to make couple buy additional photos, upsize or upgrade their album, so it is very common to see average couples pay between $1500 to $2000 for additional photos, some even spend more then initial bridal package price just for the photo album.
You can go to forum of Singaporebrides to find out more for how much is which shops is charging.
Hope this helps.