Заданный массив цен товаров:

Array
(
    [0] => 1.23
    [1] => 2.45
    [2] => 30
    [3] => 47
    [4] => 13
    [5] => 5.5
    [6] => 18
    [7] => 125.3
    [8] => 117
    [9] => 23
    [10] => 12
)