2005 rolling noise from front- buzz

My 2005 Prius is rather noisy going down the road. It has a sound equivalent to driving with metal studded tires- a buzz that changes with speed. The tires are Toyo and in decent shape. The car has over 200k, so I'm wondering if it is a wheel bearing or something else in the drive train? We have another 2005 Prius which is much quieter.
The sound reminds me a little of clipping a baseball card to flap against the spokes of a bicycle, but not quite as extreme. I'd guess wheel bearing, but I think they have more of a growl or rumble sound?
I plan to rotate tires front to back and see if it changes.

 

Yes, and at 60 or 70 it is quite noticeable.

 

I have a rather new set of tires on a currently dead Prius that I'm going to put on tomorrow. I do not have high hopes.
I know a good Toyota shop. I wonder what a fair prices would be to do wheel bearings?

 

I swapped out the Toyo tires with cheap Westlake tires. The noise went away! So, either the Toyos are inherently noisy (which I doubt), or there is a defect- or maybe something as simple as a pebble or other object embedded in one of the tires that makes the noise. I need to inspect carefully.