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Make sure the key lock in the back door is in the unlocked position, if I remember right there are rods attached to the door handle lever each ros goes from the release handle over to the edge of the door to the latches, are you able to turn the key in the lock or is it stuck, when turning the key is there any resistance like it's doing something and is there a noise, I'm going to have to look at a diagram of this because it's been quite a while since I had dealt with this so be patient and I'll get back to you.
If the window does not go all the way down the door lock will not open the door, there are switches on each side that keep the door from being opened unless the window is rolled all the way down
I think you can get it a little cheaper online, try autopartswarehouse.com/ they have a lot of Toyota OEM parts