I was thinking of using Mail Chimp's free account, but they only allow 500 subscribers. I also can't use Wufoo for the same reason - limited to 100 entries.
Is there something else that I can easily use to just collect this information in a secure way?
I will have two fields, email + URL.
After playing around with them I found that Campaign Monitor best suits me. My ranking is Campaign Monitor > Newsberry > MailChimp.
But it seems they charge every time you send an email.
So does that mean that I can register and include their form on my landing page and they will store as many users that register for my service?
There is no upper limit or no point at which I will get charged (e.g. 500 subscribers) ?
They charge you 1 cent per email + a fee of $5 each time you send. Simple.
I tried Campaign Monitor though, like matthewphiong suggested and it seems to be working out really nicely.
We'll see how things go.
What about doing your own form and data store, via Heroku or something similar?
Good luck with your launch!
I have dealt with forms before, and they can be a real PAIN. I also don't want to have to deal with any issues of mishandling data because it wasn't done properly, etc.
So it looks like Campaign Monitor might be the way to go.