Purchase and Payment Options

Payment by credit card is the most convenient. Unfortunately, the volume of charges we have received in recent years was not sufficient to cover the basic fees from Visa, MasterCard, American Express and Discover, so we have had to discontinue accepting direct payment by these methods. Instead, we have provided a PayPal link (so you can also use your PayPal account as well as credit card or bank draft payments) for those items that can be purchased from this site and we send email PayPal links with our invoices for services rendered. Checks in US funds drawn on a US bank are also accepted (see “Snail mail” below). Sorry, we do not accept bank wire transfers. Here is howto order:


PayPal is a secure online payment service that has become very popular. Be aware that clicking a Buy Now link next to any product on our web site performs a transaction for only that item. If you wish to purchase other items using PayPal, each must be done in a separate transaction the way we are currently set up.

Once we receive email notification from PayPal that your payment has been made, we create our own invoice/receipt for you and send out the item you purchased via email. Because we learn about your payment by email, there can be some delay on weekends and when David is on the road training or at conferences or he otherwise does not have email access (or if the payment is made in the middle of the night in our local time zone), but rest assured that we will get this out to you as soon as possible. The longest delay to date has been less than three days, with most orders being fulfilled within half an hour.

Your credit card will not be on file with us if you use this method of payment because PayPal processes your payment and simply puts those funds minus processing fees into our account with them.

Snail mail:

If you prefer to pay by check, you can send a check for the amount of the purchase in US dollars drawn on a US bank to:

David Swain
52 Cortland Drive
Bedford, NH 03110-4224

Checks drawn on non-US banks will be returned. The cost of accepting such a check, or the cost of receiving payment by international funds transfer, is greater than the price of many of our products (monographs and books especially)!

Please make out the check to Polymath Business Systems. Don’t forget to include your email address, since this is how we must send you the file.