$scope.addToCart = function(key, size, price) {


        //Add selected size and price

        //Add 'extra' for selected price and size
        $scope.selectedProduct.extra = {};
        $scope.selectedProduct.extra = {
            //price is a float
            price: price,
            //$scope.productSizes is a single array that
            //changes int values to sizes (1 => individual, 2 => medium ...)
            size: $scope.productSizes[size],
            //size is the int value of the size
            sizeInt: size
        };

        $scope.cart.push($scope.selectedProduct);
};

0 Object
    extra: Object
      price: "1.99"
      size: "Individual"
      sizeInt: 1

0: Object
    extra: Object
      price: "6.5"
      size: "Large"
      sizeInt: 3
1: Object
    extra: Object
      price: "6.5"
      size: "Large"
      sizeInt: 3