Need help pricing Buck Stove Model 91

Found a Buck stove 91 for $600. It has no legs as it was used as an insert and it is 6 years old. I do not know the condition of the catalyst. Does this seem like a good price? How can I visually see if the catalyst need replacing? Also do not know if the blower is working. Going to see it tomorrow. I am going to use it as a freestanding stove. It also has no collar.