PE Edition Managed Package Testing

[akrikos]

Greetings!

I'm working on testing a managed package with Professional Edition. In the past, I've signed up for a trial Salesforce account to test this package. However, since that expires every 30 days, I'd like a more permanent solution. 

I have created a PE org in the test environment (from a partner EE org), but that test PE org had access to the API for some reason which invalidated the test cases for a PE org.

Does anyone know how I could get access to a PE org to test with that doesn't expire?

Thanks,

Mark