Решил сам.
$(".mater").click(function () {
if ($(".mater_checkbox:checked").length > 0) {
mater_price = $(this)
.children("td")
.children("label")
.children("input")
.val();
console.log(mater_price);
} else {
mater_price = 0;
console.log(mater_price);
}
});