Damn, sounds like you have quite the collection. I have some sources I can ask for you and I’d be happy to let you know. If you haven’t already joined, I encourage you to join the Master Replicas Collectors group on Facebook. It’s an awesome group with people discussing and selling items all the time. Also, I’d message sellers on eBay and ask if they have any that they aren’t listing. Think outside the box.
Are you looking for brand new or pre-owned?
For the most part I try to find as close to factory new as possible. I was able to buy a factory new Obi-Wan Kenobi Episode 4 LE Edition 2/2500 in the group. On eBay, I bought a factory new Anakin Skywalker Episode 3 LE Edition 77/4500. Finally, I actually found my grail piece from a seller that hadn’t listed it on eBay - a factory new unopened Mace Windu Episode 2 SE. I still haven’t opened it haha. The others I put back into factory new box conditions until I move and can set up the ultimate Star Wars room.