Hey {first_name},

I noticed that you’re targeting [type of customer] with your online advertising, and want to make you aware of another opportunity for growing your incoming lead base. 

I know for a fact that you’re overpaying for these advertisements.

You see, I’ve discovered a nearly untapped resource of online buyer traffic for [business’ niche] and am currently shopping for partners who are interested in tapping into this source for more leads, web traffic, and sales. 

Do you want to tap into this well of leads and prospects?

If so, just reply back to this email with “I’m interested” and I’ll follow up with all the details. 

Best,

Name