So you have 9 lithographs left. That's really intimidating! Even so, you've been doing the right thing all this time: having patience! I'll keep a list of what you're looking for and if I ever stumble upon any I'll be sure to let you know!
If you were not aware of it before, Expresso Beans is an art collecting community and may be of some help in your search. Check them out whenever you can.
With such persistence, and your clear love for Dead Space, you have to succeed. You just have to. And this goes for Bayonetta and the others too.
As for the watch, I remember that when it was put up on the store. It looked so cool as it was designed to look straight out of the Dead Space universe. I wanted one... and then I saw the price. This hobby can get expensive!