sendy
Yes Amazon SES is way cheaper, but it does not mean it's of lesser quality than other more expensive services. Deliverability rates are comparable and at times, higher when compared against Campaign Monitor in our tests when building Sendy.
We see high potential in SES, such great quality at such low price. The only drawback is there is no UI for newsletter campaigns. So we built it and hopefully the general public who'd like to send newsletters but aren't too technically inclined (or are too busy to figure) can take advantage of Amazon SES through Sendy.
The only reason why it's a one time fee of $40 is because it's self hosted.
Lots of people has been requesting a demo, we'll definitely put this up.
And yes, free updates are included up to the next major version (just like desktop apps).