Our most popular small scale inventoried assays (Cat. #4331182) and extra small scale inventoried assays (Cat. #4453320) are now stocked locally in Europe and are available for overnight delivery. For orders that contain multiple assays, all of the assays must be in our European inventory in order to ship overnight. Otherwise, the complete order will ship from our central inventory location in North America with an expected delivery time of 3-5 business days. Overnight delivery does not apply to made to order assays.