Helllooooo!
We had a private meeting with Cinderella, but it was due to a Magical Moment, no something we purchased. We had visited MK early one morning on our Oct 2007 trip for breakfast with Pooh Bear. As we were leaving, a Dream Squad CM approached us and asked us what we were doing during the day. Well, we had planned on going to DHS so DS could meet with the Power Rangers (he was wearing his PR shirt), but when the CM told us we could have a private meet and greet with Cinderella at 1pm, we quickly changed plans. DS was very upset (as he has OCD like his Mommy and change upsets him - remember, he had it in his mind we were headed to DHS), but he understood that a "surprise" was going to occur at MK at 1pm. Well, we ended up at Epcot - more magic there that I will NOT highjack your thread with - and then we went back to MK to visit with Cindy. Our children were so excited to meet with her (we have a DD as well). We spent about 15 or 20 minutes with her and got lots and lots of pics (both photopass and personal). She was so gracious and truly interested in our children.
OK, so that's how we personally met a character. Again, Magical Moment rather than a purchase, but I was very surprised to learn you can do that. Thank you for the info.