- Impact
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The ones that do it WELL bring in plenty of money, but coupon sites are labor-intensive. If your coupons aren't up-to-date, expiration and terms verified,etc. nobody's going to trust your site. You'd be handling datafeeds from different sources in different formats. OR, you could use one of the coupon aggregator services, but the good ones aren't cheap. The best one is about $500/month.