Really? If I remember correctly: My Static website served from S3 + CF + R53 by about 0.67$ / mo, 0.5 being R53 from that, 0.16 being CF, S3 being 0.01 for my page.

BTW: Is GitHub Page still free for custom domains? (I don't know the EULA)

GitHub Pages are still free but commercial websites are forbidden.