If you have any colleges in or around your area that offers animal science programs, they usually do these type of things free just for the learning. Don't worry, the professors are very qualified.
You can also hold a big garage sale, ask your neighbors to donate items to you so you can earn the money for the operation. Use a big clear jar on a little table for donations. Have a picture of your dog on it and the reason your raising money. Good luck. Oh, and if I were you I would be asking all the Vets. possible what their fee is, and then go from there.