As of 2016, purchase the Honeywell Pro 3000 from online stores such as ArnoldService.com, FiltersFast.com, ShopThermostats.com or NewEgg.com. These vendors accept multiple types of online payments.
ArnoldService.com is Square Trade- and PayPal-verified, and it ships out orders that it receives prior to 3 p.m. Eastern time on the same business day to all states in the United States. Arnold Service accepts PayPal, Amazon Checkout and credit card payments. ArnoldService.com also has free online PDF downloads of the operating and installation manuals. FiltersFast.com, a Google Trusted Store, similarly offers free PDF downloads of the manuals and accepts PayPal checkout.
ShopThermostats.com accepts PayPal checkout and major credit cards. NewEgg.com accepts a variety of payment methods such as PayPal, Visa Checkout, MasterPass and Google Wallet. Alternatively, a user can pay via a store credit card to have six to 12 months of no-interest payments.