Why do Bop-It Extremes cost so much now?

So, if you type in Bop-It Extreme on Amazon, they cost around $200. Well, today, I was randomly at goodwill just to look and I came across one, and it was only $.25. I bought it because I had seen that the original ones cost so much online. I didnt know if maybe I was dreaming or something, so I thought I would get it anyways. I looked it up again. Same price. Quite a bargain, eh? So, should I sell it or what?