You should have a good mix of advertising methods to test which ones produce the best ROI. You could add Direct Mail to your marketing mix. Though expensive, it could produce profitable results provided you choose the right list brokers, discuss your product/service with them and the type of customers you are looking to target. Lists are sold in multiples of 1K and for high ticket items, it could produce the best ROI. You could even target your local business market to test how effective it is in comparison with other methods of advertising.