If you want to massively increase the amount of email signups from your website you should really consider getting a subscription to OptinMonster. You can use it to easily create popups, sidebars optin forms, flyins, end of post optin forms, and more. The exit intent technology is amazing and easy to set up.
Plans start at only $9.00 a month but that plan is pretty useless. To get the full power of the tool you will need to spend $29.00 a month.
LANDING PAGE CREATION
LeadPages is another great landing page tool which you will find most of the Big Dogs of internet marketing using. It is super easy to use and you can put a landing page up literally in minutes. The downside is that it is pretty inflexible. The landing page templates are all very slick, and extensively tested to optimize conversions, but if you want to make change to one it is a major pain in the ass.
LeadPages is a cloud hosted solution, which means if you stop paying, you lose all your landing pages. This (and several other annoyances) are one of the reasons I have started moving my landing pages to sites using the Thrive Landing Page plugin instead.