Hi April! Thanks for the kind words about the Moms Panel!
Here is a list of the rides by park that have in-ride photos:
Magic Kingdom - Space Mountain, Splash Mountain, Buzz Lightyear's Space Ranger Spin
Epcot - Test Track (This is also the only ride that allows you to add the photo to your PhotoPass card)
Hollywood Studios - Twilight Zone Tower of Terror, Rock N Roller Coaster featuring Aerosmith
Animal Kingdom - Expedition Everest, Dinosaur
Moms Panel Jackie answered a similar question on pricing and had a great answer that can be found
here. Its always important to note that the prices can change at any time, so please use these as a guide only. Occasionally there will even be a sale - on my last trip I was pleasantly surprised to find that ride photos were "buy one, get one free"!
Unfortunately for us, buying all of the photos from every ride is out of our budget - especially since my family MUST ride Buzz at least 6 times per trip! We've reserved the photo purchases to the "must have" photos - mostly of terrified expressions when I am forced on Rock N Roller Coaster - BUT we do snap a photo of each ride photo with our own camera. The resulting quality is very poor (picture of a picture displayed on a screen), but we still love to look back on those pictures and laugh!
Have a great trip! I hope some our your Magical moments are caught in the photos!