Online Small-Scale POSTAL Mailing Firms?

Posting this query to these two groups because I suspect some of their readers may have the answer at their fingertips:

An organization I'm involved with has a medium-size email distribution list (say 800 names) it uses for announcements and alerts sent at random times.

There's a small residual set of hold-outs (maybe 50 names) who don't have or won't get email and want these messages postal-mailed to them.

Are there online services that will accept a message, a few instructions, and a small list of names and addresses online; print, stuff, stamp, and mail the message to this list of names using some low-end automated machinery; and bill the organization online -- at low cost?

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