This site and their sister site http://www.cheap-tv-spots.com/ look like interesting options.
As always please do your own due diligence before entrusting your money to someone online.
Here’s what they have to say about their service.
TVSellsRealEstate.com offers up-front pricing and simple ordering. Free custom ads are ready for network delivery within 24 hours. With purchase of an inexpensive air time package, advertisers get copy writing, editing, property or agent photos, images, dynamic graphics and music, network negotiation, clearance, and delivery to cable TV or broadcast TV networks. The packages aren’t padded with hidden fees like most agencies do today, so the air time is a great deal, too.
The techie-run, “Johnny come lately” template ad sites, with their inflexible canned ads, hard-to-use forms and padded air time rates, are unsuitable for the real estate business, which depends on personality and service to attract customers. Busy agents and brokers don’t have the time, know-how, or patience to write and polish TV ad copy, to sift through generic templates that could be used by anyone (even competitors), or decipher hard-to-read air time schedules.