isn't the price in the ClockPrice column?
instead of binding the Price cart column to the ClockSize recordset column:
$ATC_itemPrice = floatval("".$row_rsPriceLookup['ClockSize'] ."");// column binding
shouldn't you be using the ClockPrice?
$ATC_itemPrice = floatval("".$row_rsPriceLookup['ClockPrice'] ."");// column binding