When I started collecting in 2007-2008, I got a ton of Cybertron figures on eBay, usually at close to or slightly over retail price (MISB). Now that was 5 years ago, so I'm sure prices have gone up, but there should still be a lot of Cybertron figures available at reasonable prices. Then again, that depends on your definition of "reasonable". And of course, it differs from figure to figure. Former shelfwarmers from the Cybertron line are going to be cheaper and easier to find then the rarities.