Most online merchants utilize one of the following delivery services.  If you were given a tracking number at the time of purchase, use one of the following websites to locate your package.  If you were not given a tracking number or delivery confirmation number, please contact the merchant you purchased the item from. They should be able to tell you when an item was shipped and through whom:

U.S. Postal Service Priority Mail Tracking

Federal Express (FedEx) Package Tracking
Phone: 1-800-463-3339

UPS Package Tracking
Phone: 1-800-742-5877

DHL Worldwide Express Package Tracking
Phone: 1-800-225-5345 (U.S. customers only)

Airborne Express Package Tracking *
1-800-247-2676

* Note: Airborne Express and DHL use the same online tracking system. The tracking website displays DHL signage.