I think either one of these autoresponders are ok.
In fact, it may still expensive but I recommend that you should use autoresponder as a way to get into contact with your customers.

Customers do not buy from you in 1st contact
You need to continuously add value and autoresponder is a great way.

For me, we blog about how people can use law of attraction in their life
We ask readers to subscribe to our autoresponder so that we can reveal more things to help them.

If you any motivation, visit us.

Cheers!