John,
Welcome to the Forum. Some great deals are showing up on eBay and CraigsList recently for right around the target price. Check the Classic Electronic Organs on eBay thread, and the CraigsList Organs thread for occasional updates.
Unfortunately, many of the CraigsList links expire less than a week or two after they are posted--that's the nature of the list. At least the eBay postings are held for the duration of the sale plus a few days (but are unsearchable after the posting closes).
Hope this helps get a good organ into the hands of an organ student.
Michael
Allen Organs (505-B & ADC-6000 & ADC-4300DKC), Frazee Pipe Organ (2/13 w/chimes),
Pump Organs (Estey, Sears & Rbk, Mason & Hamlin, Chicago Ctge, Williams & Sons, Angelius, Cornish)
Pianos (Ivers sq. grand ca.1865, Ivers & Pond 1929, Technics SX-PR600)