The Global Shipping Program is not clearly marked if you are shopping on a mobile device.
If you are using a desktop or laptop, use a Search List rather than Gallery display. This option is on the top right of the Search as View.
GSP items will have
Customs services and international tracking provided
showing on the List.
However, there is no way to only see or to ignore items selling with the GSP.
Be careful when buying through the GSP.
Make sure the seller knows she is signed up for it, and that she should NOT ship directly to you.
Don't bid on GSP items valued below $50 maybe even $100, since the import fees charged by GSP are usually NOT charged when shipped via the postal system. Usually.