Wow! You really do have lists don't you! The good thing is you have a whole lot of those things done already. Also, some of the things that you need to still do/buy are pretty easy to do/find so that's good.
I was just over on the Disney Photopass site and saw that there are a couple of special offers. I remember one being $15 off the CD. I don't remember though if it was for pre-purchase. It's definitely worth you checking it out to see. Hey, fifteen bucks is fifteen bucks.

If you don't see it on the site, let me know because I emailed the link to my cousin (who was at Disney the same time we were).
I bought our pop-up hamper thing from the Dollar Tree. You know what I found to work better though (and hold more clothes)? The mesh laundry bags that are sold at Dollar Tree. I could smush the clothes down into it and it was easy to carry down to the laundry. We only did laundry once while on vacation and that was only because Mama wanted to do it. The clothes that were in the other laundry bag when we left, I just left in there and crammed the whole thing in our large suitcase.
The
Walmart in our town has the mister fans. I remember them being cheap in comparison to those sold at Disney. I think they were about $10.00. They also had small misters. They are about the size of a large cassette tape and had a clip on them. I gave one to Hunter last year and he'd clip it onto his belt loop so he didn't have to ask for it every time. We refilled the water chamber when we saw water fountains. I think they were about $3.00.