We do not sell our paperback books directly, but they are available through various distributors. 

Bookstores and other resellers: For orders requiring credit or invoicing, please order from Ingram in the US (If you have trouble with that and are fulfilling a special order, please note that Amazon.com carries all our books and accepts purchase orders through credit-approved corporate accounts.)

Schools and libraries: For handling of a purchase order, please order from Ingram or NACSCORP (If you have trouble with that, please note that Amazon.com carries all our books and accepts purchase orders through credit-approved corporate accounts.)