Netflix no longer accepts "Pay by Check" as a payment method. From the Netflix Help System:
Q: Can I pay with a check or be billed in the mail?
A: To make sure we can ship movies as quickly as possible, we accept debit cards issued from Visa or MasterCard and all major credit cards (Visa, MasterCard, American Express and Discover). Payment methods like traditional check-in-the-mail payments, money orders or purchase orders take longer to process, so we are unable to accept them at this time.
via Nina on Dallas Dance Music.