Tapioca pearls and all bubble tea supplies can be purchased at www.bubbleteasupply.com. Easy instructions are provided to help you make the perfect drink. Email for more information at firstname.lastname@example.org.
I have been shopping in Chinese store today and they had quite a number of different tapiocas there. If you want to get some, store with Chinese groceries will have them. You can find them in your phone book if you don't know where any of them are.