Get some quotes from your local printing companies/mailhouses. I frequently do mailings for my clients and we provide the mailhouse with our criteria and they provide the lists. They do all the zip code sorting, deduping, etc. I've even gone so far as to print with one company and mail at an entirely different one because the printer is fabulous, but not so great at mailing and the mailhouse is great with distribution, but not so great with the printing.

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Jill Tirone
DanceFit Marketing LLC