Best place to buy Prius V 5 17in wheels?

eBay is your friend, although I bought my set of four from a fellow PC'er.

You really want four snows, even on a FWD vehicle.

 

They don't keep their web page very up-to-date but it looks like Wheels and Caps has both 16" and 17" refurbished Prius v wheels:
Replacement Factory OEM Aluminum Alloy Wheels


I bought four 16" steel wheels from Tire Rack to use with winter tires (Bridgestone Blizzak WS70) on our 2012 Prius v Five to get a wider selection of winter tires at lower prices than 17" tires and also to get a more pleasant ride over potholed winter roads. If I had a do-over, I would buy the 16" OEM Prius v wheels from Wheels and Caps and use little caps on the wheel centers instead of full wheel covers. The black Tire Rack steel wheels look awful without wheel covers and don't accept wheel covers very well.

Use winter tires on all four wheels as Air Boss said. Using them on only the front can cause erratic handling. A good tire shop won't even install only two winter tires if you have all season or summer tires on the back.

The refurbished wheels I bought from Wheels and Caps for our Sienna were absolutely like new and still are after four winter's use.