Expensive. What is your closing rate?

We have some experience building platforms for such purposes. Here is essentially what you need.
Servers now a days can generate dummy place holder websites (landing pages) that are optimized for search marketing.

Search Marketing is more than SEO is a web of social media interactions, content creation, links used in your social media, location enabling each time you upload, branding, shares, etc. having server generate websites you can have hundreds of simple lead generation pages created after each Google query. You couple them with blogs, reviews, videos, pay per click...

I would say that you are looking at spending about $100 per hour or more creating this system but once is done the cost could reduce itself to $10 per lead or so. Maybe less depending on your industry and brand strength.

Tip: While conducting your research never query a Google search and click on your competitors links. In googles "mind" this tells its crawlers that you searched and found something relevant so it will from now on include that link to the search you typed, hence giving more SEO power to your competitors link.
If you must, right click and copy the link then in an incognito window paste the link itself. Never off a search result.

Happy marketing. ;)