$250 is outragous, I spent that shipping that patcher from SD to CA, and that was three boxes and HEAVY.
Most of the Goodwills use a packing service, and most machines like this cost less than $50 to ship, which includes the service of the packing company. If it's in a cabinet, just take it out and donate the cabinet back to Goodwill.
Hopefully HankAndy can help you out.