It depends on the time you visit. If you know your dates, I'd recommend calling WDW-DINE and ask a CM to tell you the price of the meal you're wanting to book.
We booked a Tusker House character lunch for value season II in August & they told me $30.88 per adult including tax (but not tip). Chef Mickey's I think was also that for breakfast, not sure, because we booked a dinner. I don't recall exactly, but it was about $15/more per adult for dinner.
The CM's are very helpful and didn't mind looking up prices for me at all while we booked my ADR's over the phone. You can book on-line but I called for that same reason (we are paying OOP)