Is there any way to track PBS Market purchases? So far I have a receipt via a 'thank you for your purchase' email but have no idea whether the books were sent or when to expect them.

Try going to 'Receipts' under the 'My Account' tab.  When I click on the receipt, it shows a link to track on Endicia.com, and that shows all the tracking details (and also has a link to USPS.com for more detailed information).

Thanks, Sherry.