Postcards, Mailings, Flyers to Sphere of Influence

I'm looking for any information on Realtor related websites or magazines that sell postcards, mailers, magnets, etc... for good prices to mail out to my sphere of influence. Anyone out there had any success with one particular website or magazine? Also, has anyone used the service to mail out your mailings (exporting your mailing list to the actual company) Looking for any information, and/or good resources. Thanks and have a great weekend!