After mail out, you get a confirmation email with a tracking number of your package. Each shipping method has different format of tracking number. Bellow, you can see examples of tracking numbers and where to track your packages.
The cheapest shipping method provided by Planet Express. Tracking number has the format PLANET. You can track your package on this website.
Right after mail out you get tracking number in format PLANET. After a few days tracking number is updated but you can still use the first tracking number. You can track your package on this website.
FedEx has detailed tracking for both (Priority and Economy) methods. Tracking is available on this website.
DHL provides also detailed tracking. You can track your package on this website.