You can try Nextsale for a 10 days unlimited trial. No credit card is required!
After creating a free account (adding the Nextsale app), you will get immediate access to all Nextsale features unlimited for the next 10 days. At the end of the 10 days trial period, your active campaigns will be paused, and you'll be notified via email. When your trial expires, you can choose the subscription plan based on your website traffic - monthly unique visitors.