I love Clickfunnels as it's allowed me to create many landing pages and sales pages easily, and I'm no web designer. It's the easiest builder to use out there on the market today. It also comes with the full funnel so you have the checkout function that integrates with Stripe.
It also has a membership area so it's ideal if you also have a course or membership site and you need to get up and running quickly.
All you need to do to get started is to click on the Clickfunnels badge at the bottom right of this page, and then start your trial.
You get 14 days for free to try it out and then there are two options for monthly payment depending on what your needs are.