Ask HN: Testing Android app on multiple devices without buying multiple phones?

We are about to begin testing our Android app and don't want to go out and buy 40+ handsets to test on.

Are there any services that allow you to load an app on different devices for testing?

Specifically, we are looking to make sure the app functions correctly (ie: doesn't crash etc..) and the UI is consistent.

Something similar to browsershots.org but, for Android devices.