That's wild. At HEB I ask the butcher and get them either free or dirt cheap.
I have found first thing in the morning (weekdays) while they prep is best. I stop in before work. A couple times they were free and typically pay 25 cents a pound. Its been high as a dollar and even a penny a pound. I don't question it, just say thank you and go on my way. I would try that.
The only way I would pay a lot for bones if they were the fancy looking large bones and you are serving an elevated marrow dish and need the presentation.
I will ask for some fat trimmings (if smoking something lean like prime rib) and bones to make a gravy and stock. I like a traditional gravy or au jus; however I like smoked meat from the offset. Gravy made from drippings when you smoke something is the offset is terrible. I did it once and laughed out loud because it was so bad one Christmas.
Now I render the fat separately and roast the bones and veggies in the oven, then transfer to a pot and make stock. I do the same with turkey, except I buy wings and necks to roast in the oven along with my celery, onions, and carrots, then throw it in a pot to make stock and scrape the fat for gravy.
This thanksgiving will be spatchcocked turkey on the smoker with a traditional gravy made the day before.