I used to have a neogeo CD and I sold it locally almost 10 years ago to a video game store owner for a good price.
Long story.
I bought it 2nd hand from my friend in HK. Later I bought it back to HK and tried to sell it there but the price was so low that I would rather keep it so I brought it back to Canada. Then I post an ad in Chinese buy and sell and sometime later a taiwanese guy told the video game owner about the ad and finally he got it. I used the money to buy a white sega saturn and I still own it.