May 16 2019 01:37 AM - edited May 16 2019 01:39 AM
I saw @Karuana Gatimu talked about getting an Test Environment yesterday.
You can also get a free Developer Tenant.
But I'm not sure if Flow / PowerApps will qualify as "development" which will extent the Tenant every 90 days.
https://developer.microsoft.com/en-us/office/dev-program
Maybe this is also a good option for some of you guys