Hmm I can't find any prices but can tell you that I believe the prices are pretty comparable to Disney. My family of five(3 kids ..16, 11, 9) cost around $70 for Lunch for basic burgers, nuggets, fries and a drink..
We ate at spice mill for lunch. We had basically the same thing except I had salad and my husband had a beer. It cost around the same give or take a few dollars.
We ate at sharks. My meal was $25. I think the kids meal was &14? My girls split a $32 steak.
You might want to look at the dining plan...I heard its good.
I do have to say that I enjoyed my lunch at seaworld more than my lunches at Disney.