Will rebellion reprint some of these out of print collections. For example if you want rogue trooper tales of nu-earth volume 3, you can buy one from amazon in a meager price of 891.4£
Robo-hunter Droid-files 1 is also out of print it seems :(
Amazon isn't a good indication of value—that's just scalper/desperation central. Head to eBay's sold listings to see how much these are going for on average. v3 of Rogue is seemingly quite rare though. I sold mine recently for about 50 quid.