Hi M.,
I have taken my daughter to Portrait Innovations (they have a website) 2 or 3 times now. They run specials about every 3 months that coincide with various holidays/seasons where you can get a 1 pose package for $10. The package includes a variety of sizes and has proved to be plenty for our christmas cards, etc. You can also do packages with more than 1 pose but they start to add up pretty quickly. They usually have a seasonal backrop/prop room and then a blank canvas room with misc. toy props, etc. The other plus is that you get your pics printed within 20 minutes or so. If you want to get all the shots on a cd, you have to buy 3 poses.
Overall, my experience has been positive. I would call and make an appointment, as with anything like that, if you choose a weekday mid morning or something, they are likely to be less busy and able to give you quality attention. Also, there's an activity table with legos to keep kids busy.
Hope this helps!