Yes, it's still available. On the questions:
1. Not completely sure. I bought it used about ten years ago, and I think it was about five years old then.
2. No, it works fine.
3. No, I don't. Since it's not as simple as a software upgrade (you get a new PC, too), I haven't done it.
4. It has optical detectors in the floor. I have a complete spare set, too.
5. I have no idea, I've never used Foresight.
6. I don't. A wild guess would be about $1,000...