I gave some of my CARDBOARD BOXES away for free. I even paid for shipping. =D
Yeah ebay is terrible for people splitting up games now. It goes (for turbo) box, case (if it had one), manual, then HuCard. Sad really. Genesis sales have been that way for a while as well. Not everyone, but quite a few sellers are starting to follow this and milk it for whatever they can.
For turbo boxes I really have no idea what to really charge. I feel bad to even charge anything. It's a damn cardboard box. That's all I see. Not $$$$$$$$$$