My son just purchased a bottle of Eagle Rare at a local store here. We have a local retailer that has an amazing selection of bourbon and I'm often shocked at what they have available. It wasn't cheap (I'm not really sure what the normal cost of Eagle Rare is) at $100.
I think I bought my bottles of Eagle Rare around $30 to $40. That is a decent price and what the state liquor control says it should be sold at. I probably wouldn't pay more than $50, but that is just me. I think over $50 you are just paying for the name not necessarily the quality of the bourbon. Of course, that's Michigan too, prices vary depending on where you live. The coasts always seem to be a bit higher.