Red's Pawn shop in S. Bend provided me a very good professional grade oboe, about $7-10K these days, for just under $1K a few yrs back. I think I found it on ebay, not sure. Craigslist also could get you a LOT more for your money, BUT take a tenured (not in his own eyes) guitarist with you. What little I know is about how the sound is created from Music Laboratory at Interlochen Music Camp about 50 yrs ago. The kind of wood used, its thickness or variable thickness, the specific shape of the hour glass, how the neck is connected and integrated to the body, the material of the neck, the material of the bridge and how and where (specific distances) it is, the style and type of string retainers at both ends, type of string, the material and style and integration of the bars, for quick and accurate and secure tuning, the specific mechanism employed for tuning the strings should be some considerations. Another is if you get a cheap guitar you could be very well discouraged from playing or continuing it due to inherent and unavoidable flaws of a cheap guitar. It might be a lot better to buy a good used one with aesthetic flaws than a new poor quality one within your price range. Good used instruments, even professional grade ones, get banged up sometimes and just cannot be kept for the demanded aesthetic appearance also by the audience but are perfect for one not there yet but desiring a superb sound and characteristics of a professional or high quality instrument. If it has been slammed to the ground, forget it. All joints and connections and laminations must be tight in order for the instrument to properly resonate.