On the way out of rides with photos (or near the exit on others e.g. space mountain), there's a little hut or similar with a bunch of screens displaying pictures.
What you need to do is find your picture, remember the number, then ask one of the people working behind the counter for a (whatever) of photo (your number).
They do quite a few (whatevers) e.g. photos, keyrings etc
BTM is slightly different if I remember rightly as the screens are on the way out, but the staff you pay are round the corner.
on a related note, why did they have to stop selling the cheapest, card based frame? I used to really like those as they were cheaper, smaller and easier to store, so perfect for me. Now, you seem to have to buy a "proper" frame which is kind of bulky.