I could not figure out how to terminate domains on dotster so I'm just letting them expire.

One expired on Apr 9, and I get the 15 day grace period, but that should have dropped by three days ago. I'm still in the registry (wonderfulwebpages.com)

Do I need to do anything, or will it drop eventually so as I won't be stuck with any bills?

Does Dotster actually drop expired domains that quickly?

You are off the hook for the renewal unless you've agreed to an auto-renewal in advance.

-t