Wed, 09/27/2023 - 16:16 Tech Insider Bryan Clayton, left, a cofounder and the CEO of GreenPal, and Barbara Casey, the CEO of Mobile High 5.GreenPal Tags Small Business, marketing-for-small-business, SMS, small-business, edit-series, editorial-sponsorship, sp-freelance, sp-2023-mfsb, sp-google-smb-2023-2 Source SMS marketing may cost more to set up than email, but 2 small-business founders…