White Oak might be one worth trying for example or at least some of the cows there anyways. They could also potentially get more elephants from Europe or Australia.
It's hard to say. Perhaps from ALS, White Oak, or maybe even an import from Europe. Oregon was actually supposed to recieve some animals from Europe iirc but plans changed once the pandemic hit due to financial reasons.
You can rule out Australia. They don’t have the cows in the meantime, and probably won’t have any surplus cows for a very long time due to their newly established population.
Europe meanwhile does have surplus females and seemingly have had plans to offload many individuals to the US in recent years (most of which have been cancelled due to covid). But there’s really no reason why new plans can’t be made.
From what I’ve heard White Oak have an interest in maintains their females as a large herd. They don’t really have many candidates at the moment too (especially if they wish to continue breeding) but may going forward.
ALS seems the strongest option. With a herd now exceeding 20, they have plenty of young females that are reaching breeding age and are related to their current bull. ALS is also quite close to Oregon, so shouldn’t be hard transport wise.