Some Sci Fi Gaming Resources on the cheap

Picked up a couple of Star Wars Essential Guides in the Discount Bin at a Comic Shop, while I'm not currently planning on running a Star Wars Campaign, I'm thinking with a bit of reskinning I can get some cool locations and aliens to use in my Sci Fi Campaigns (X-plorers, Stars Without Number, or whatever your Sci Fi game of choice may be). I scored both books for only $5.  : )