How much time will it take to find an alternative? If it takes an hour, you've spent way more than $60.
Also, I wouldn't value my time at $60/hr right now. When you're barely paying yourself in order to grow, hard to think of it that way ;)
On MailChimp our cost is $210/month on SendGrid it is $100.
However, looking at their updated pricing, they also now have "Marketing" as a separate pricing tier, so I can't say exactly how that will affect us.
Keen to hear suggestions of who else to use.