Mickey isn't usually at LTT. If you are counting on a meal with Mickey, you might want to pick another (Chef Mickey's Donald's Breakfastasaurus in AK....) SOmetimes the characters so change, etc, so they don't always say for sure who will be there, but I have never heard of Mickey at LTT (It's usually Minnie, Goofy, Pluto, Chip and Dale). It's one of our favorite character meals -- just not one with Mickey.
The Judge's Tent in TOon Town is a great spot for Mickey, though!
$150 sounds reasonable. If you use Photo Pass, you can wait until you get home to pick and choose which ones you really want. I think 5 x 7's are 12.95 each and 8 x 10's 16.95.
There's also some cool photo opps in the WAY back of Exposition Hall. You walk in and it looks like a store but if you keep walking way back, you come to a bunch of cute cut outs where the kids put their faces in the holes. etc. There's a Buzz Lightyear thing, Steamboat Willie/Mickey, 101 Dalmatians, and Snow White and the dwarfs. It's cute and usually very uncrowded.