Thank you naf_appaz and Wyorp Rock! I made some inquiries and - yikes - $320 was the lowest cost. With no guarantee of success. I have read accounts of vets doing the surgery, and then the unfortunate chicken dying from the shock.
You know, I'm old enough to remember when the vet would come out and treat your animals at your farm, just as the family doctor would come and treat us when we were sick. And Dad would pay the fee out of his pocket without taking out a bank loan. Kind of says something about all of our progress, doesn't it?
My newest hen is improving after 3 days of regular feed and Rooster Booster in her water. She was never fed anything but bird seed and whatever she could scavenge from the neighborhood, then drinking water from air conditioner drain pipes, until we got ahold of her. I cleaned her toe up yesterday, then used betadine on the infection. I'll start her on Tricide Neo this week, my wife keeps Koi and knows about, but we never realized it can be used on chickens.
Again, thank you for your help!