I use AmazingMail's API and they have been great: http://www.amazingmail.com/direct-mail-automation http://www.amazingmail.com/direct-mail-automation Pricing

I use AmazingMail's API and they have been great: http://www.amazingmail.com/direct-mail-automation http://www.amazingmail.com/direct-mail-automation Pricing is much cheaper. Main downside is there is a rather sizable one-time setup fee. But for printing, you are going to need to work with support to ensure things are working well, so this support is what you are paying for.