The preferred method of payment to me is online by credit card via PayPal.

You can make a PayPal payment without having a PayPal account. Enter the invoice number and invoice amount, click the "Check Out" button, then look for the option to checkout without having a PayPal account.

Payments can be made by check by mailing to:

T. M. Taricco
P.O. Box 411
Redmond, WA 98073