Apparently, my eBook page was acting up and the PayPal buttons weren't working. After hacking into the code, I discovered some missing form fields. No idea how that happened. They were working fine up until a month or so ago.
But it's fixed. You can now order my stuff using both PayPal and Google Checkout, whichever you prefer.
If anyone runs into any problems purchasing eBooks, Red Work Courses, or any Applied Hermetics services, please let me know.