http://www.cakecentral.com/modules.php?name=coppermine&file=thumbnails&album=69
there are several larger cookie type cakes under the cookie section of the CakeCentral gallery ... I'm not real sure what the charges for a cookie cake would be... since it's one large cookie and not many individually decorated cookies, I wouldn't think you'd charge quite as much for it... maybe someone else can give you an idea of what they charged for one 
there is a recipe posted for an award winning chocolate chip cookie somewhere on this site..I've used this recipe to make the cookie cake and my family loved it...
You can use just about any regular cookie recipe or mix or prepared cookie dough. Well, the old standard over 20 years ago, for pizza cookies and such, when I was making them, was the following:
Monster Cookies
6 cups of smooth peanut buttter
2 cups of softened butter
6 cups of packed brown sugar
4 cups of white granulated sugar
12 eggs
1 tbsp. vanilla
1 tbsp. corn syrup
18 cups of rolled oats - I use Robin Hood Old Mill large flake oats
8 tsp. baking soda
2 cups of semi-sweet chocolate chips
2 cups of Smarties or M&Ms
You need an absolutely huge bowl for these or a preserving kettle. In mixing bowl of you Kitchen Aid, cream the peanut butter, butter, brown and white suagr - together. Beat in eggs, 2 at a time. Mix in your vanilla and corn syrup. Now transfer to the huge bowl or pot. Mix in remaining ingredients and use an ice cream scoop to drop onto greased cookie sheets. Flatten with your hand and leave 2 inches in between. Or you can drop by rounded teaspoonfuls for smaller cookies. Bake at 350F for 7-8 minutes for smaller cookies, 10-12 minutes for icecream scoop sized cookies. If you overbake them they will be hard. Makes 5 dozen - 3 inch cookies, 1 dozen 5 inch cookies and 1 large pizza cookie.
For pizza cookie, use 3 cups of cookie dough pressed into a greased 12 inch pizza pan. You can sprinkle the pizza cookie with more chocolate chips, M&M's, butterscotch chips, cereal flakes, coconut, peanuts, red licorice or anything you think will go well. Bake for 12-15 minutes and serve in wedges, warm or cold. I used to make the pizza cookies for bake sales. Local pizzerias would sell me their boxes or donate them for advertising purposes.
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