I've got all the regular editions and a few variants. Right now, there's no problem finding the OT ones. The only three that are hard to come by are Luke ROTJ (blue tray), Obi-Wan AOTC, and Dooku AOTC. I'd say get just the ones you want first, and wait for a good deal on the others. As lazbum stated, forums like rebelscum are a great place to find deals on minis.