Collecting Absolute series

I'm a bit late to the party as a beginner but I've become interested in collecting the individual issues of Absolute Batman, Wonder Woman and Superman. What's the best way to get my hands on them? (Will there be reprints, ebay, etc)

UPDATE: Been collecting Wonder Woman and Batman from local comic stores and eBay and I love them! Batman #1 first printing is so hard to come by without spending an arm and a leg tho 😭 Next is Superman and Green Lantern 🔥