The best way to compare Yelp advertising costs with LSA is to compare the cost of acquiring an actual customer, not just the advertised cost or cost per lead. The two platforms can charge differently, so a lower cost per lead does not necessarily mean lower overall customer acquisition cost.
Track the same metrics for both platforms:
For example, if Yelp costs $1,000 and generates 25 leads while LSA costs $1,000 and generates 15 leads, Yelp looks cheaper at first. But if only 3 Yelp leads become customers and 6 LSA leads become customers, LSA is actually producing customers more efficiently.
Just compare Yelp vs. LSA based on qualified leads, customer acquisition cost, and revenue and not just cost per lead.