Wanting to buy an ENS that someone else owns. 
I see it on OpenSea, but it's not explicitly listed for sale. 

Do I just make an offer for it?
Is there a better way?

Wanna be the very best. Creator of @moxiescout /miw. ゼニゼニ

Building /bright-moments - minting onchain art IRL | /purple #15 | FID 129 #magikarp | getting paid to post with @ampsfun

Bidding can alert the owner to demand, which might encourage them to renew just to extract a higher price. If it's not urgent, I would keep an eye on it until the grace period expires and then participate in the auction once it hits a price you find fair.

Thanks for picking this up.

The one I was looking at on OpenSea expires in October. 

Another Is currently in the grace period until late July (have this on my calendar but not sure what to do after that).