Suggestions?

Devil's Food Cake - Recipe Cost

Cost information for the following is not included. Normally this is because the quantity or ingredient is unknown

2/3 cup (about) sour cream

Recipe from Bon Appetit via epicurious.com

Ingredients	Per Serving Qty	Common Price	Price per Serving
Cake	1/8 cake	$1.99 per item	$0.25
1 Â¼ cups sugar	2 tablespoons	$1.44 per pound	$0.10
1 cup buttermilk	2 tablespoons	$3.09 per quart	$0.10
2/3 cup vegetable oil	1 tablespoon	$3.00 per 48 fluid ounces	$0.04
2 eggs	1/4 eggs	$2.53 per 12 items	$0.05
1 teaspoon vanilla	1/8 teaspoon	$8.00 per 8 fluid ounces	$0.02
1 Â½ cups all purpose flour (I used 7 ounces of cake flour)	3 tablespoons	$2.99 per 5 pounds	$0.03
Â½ cup unsweetened cocoa powder (2.5 ounces)	1 tablespoon	$7.29 per 10 ounces	$0.13
1 Â¼ teaspoons baking soda	1/6 teaspoon	$2.59 per 10 ounces	$0.01
Â¼ teaspoon salt	0.03 teaspoon	$2.91 per 16 ounces	$0.00
Frosting	1/8 frosting	n/a
Â½ cup (1 stick) unsalted butter	1 tablespoon	$3.99 per 16 ounces	$0.12
2 ounces unsweetened chocolate, chopped	1/4 oz	$3.49 per 11 1/2 ounces	$0.08
1/3 cup unsweetened cocoa powder (1.5 ounces)	2 teaspoons	$7.29 per 10 ounces	$0.09
2 teaspoons vanilla	1/4 teaspoon	$8.00 per 8 fluid ounces	$0.04
2 cups powdered sugar	1/4 cup	$2.59 per 2 pounds	$0.09
Total per Serving			$1.14
Total Recipe			$9.13