I recall these were a little pricier due to part of the proceeds actually going to a hospital charity. I wanna say I paid $80-$90 for mine. I'd have a hard time letting my copy go for less than $100.
...also forgot that there were a handful of extras that came with it (hand sanitizer, medical badge, cart stand). I think the value would be dependent on all those extras being included or not.
Here's a link to the original FS thread which says they were sold for $100 with proceeds going to the Children's Miracle Network and the Children's Hospital of Pittsburgh.