I have a number of students considering the purchase of their own bassoon. At this point in their development I would recommend spending $4-9k on a bassoon that would get them all the way thru high school and into college.
Having said that, there are some factors we can use to rule some sellers out. If the answer to any of these questions is NO, you most likely do NOT want to consider that instrument.
Please see my other page of links for reputable double reed suppliers.
Freelance bassoonist and carpenter of the reedy persuasion in Tucson, AZ.
Habits of Musicians
Have Bassoon Will Cook
The Pedantic Bassoonist
Double Reed Ltd.