I'm not sure if this is the answer you are looking for.... but
Disney does offer the Photopass CD (a CD with all of your Photopass photos from one trip on it) at a discount IF you purchase the CD BEFORE you arrive for your Disney vacation. I believe it is $99 for the CD if you order before you arrive and around $130 if you order once you get home.
When we are taking a week long vacation, we always purchase the CD before we leave. If we were to buy just 2 4x6 photos from Photopass once we got home, it would cost us $14 including shipping. If we get the CD we can have upwards of 150 photos (plus we can add all the decorative borders like "Disney 2010" and we can do the fun pictures where it looks like we are holding Tinkerbell, Simba, etc. - so sometimes nearly 200 photos) and we can print them wherever we'd like - Walmart, Target, etc. at a rate of $.14 per 4x6.
I'd recommend purchasing the CD before you leave if you are interested. We've always enjoyed it. Just be sure to take advantage of every Photopass oportunity you can!
Have a great trip!