I want to be able to schedule some simple EC2 EBS backed instances (already configured) to start at 8am and stop at 4pm. This is only time I'll be using my integration server.

Is there a simple services (paid or not) that I can use to handle this. All I found so far is to buy a cheap VPS at linode or somewhere and install ec2 tools and schedule via crontab, but what a PITA that is to. On the other end is something enterprisey like Rightscale but not my idea of simple.