Anyone in Oregon have a State Farm agent they can recommend? I do not have any policies with State Farm, but from what I can tell, that shouldn't stop me.
Read up on the topic before you go with a traditional insurance company. Understand fully what will happen if you need to file a claim and how filing the claim will impact your current home and vehicle policies.
I just got a stand alone policy for my Mavic and Phantom 3 4K for $60 a year. I am in Portland, but the plan was sent to regional (OR and WA) for approval. So, you should be able to get it anywhere in Oregon.