Looks like you can get Galaxy at War for $50.
https://www.amazon.com/gp/offer-listing/0786952210/ref=tmm_hrd_collectible_olp_sr?ie=UTF8&condition=collectible&qid=&sr=There's also a copy on eBay.
Plenty of copies going for way more than that.
Abe Books has plenty from your list and a bunch that you don't have listed.
https://www.abebooks.com/servlet/SearchResults?bsi=30&kn=Star%20wars%20roleplaying%20Wizards&pt=book&sortby=20&prevpage=1Secrets of Tatooine
The Dark Side Sourcebook
Alien Anthology
Ultimate Alien Anthology
Invasion of Theed
Arms and Equipment Guide
Ultimate Adversaries
Power of the Jedi Sourcebook
Coruscant and the Core Worlds
Galactic Campaign Guide
Revised Core Rulebook (if you don't have it)
Lots of these are at a decent price.
You'll have to hunt for the best prices.
Looks like you'll have to really shell out some cash to get the full collection.
Goodluck!