Direct mail postcards are the cheapest mail to reach your customers via mail. Average ROI can be expected to be 25-35% when running a relatively competent campaign. We can, however, supercharge our direct mail campaigns by using data to personalize postcards to consumers. Spend on these campaigns starts around $10,000. Any less than that and you might only be able to send one, maybe two depending on personalization points, postcards to your target we have found to be much less effective than three touch-points.