I am looking for a list of SaaS providers across all industry verticals in US. Any suggestions.

This depends on where you are located but in many major cities (U.S., Europe and Asia) there are showrooms buyers shop. This means, for a fee, your products are guaranteed to be viewed by buyers (though there is no way to guarantee they will select to buy them). These buyers range from local shops to regional chains to department store and boutique buyers. If you are picked up by one or more and show data to these online specialty stores, that is more appealing than a cold turkey approach. Simultaneously building an online following is key as well since both retailers have e-commerce-savvy demos.