Really need to buy alloys...what's compatible?

“online” is a broad term.

Can you make a finer attribution for that data point?

 

Just playing on tirerack.com

https://www.tirerack.com/wheels/WheelCloseUpServlet?target=runWheelSearch&initialPartNumber=W19226500IP9GM&wheelMake=MSW&wheelModel=Type+85&wheelFinish=Gunmetal+Painted&showRear=no&autoMake=Toyota&autoModel=Prius+c&autoYear=2016&autoModClar=Three

 

There are a few wheel sizes that fit. For now let’s restrict it to the ones that can work with the tires you already own, so that would be 15x5 and 15x6.

You need a 4x100mm bolt pattern, and you want alloys, and you want a set of 4 under $500 and vaguely “Toyota-ish."

The briefest of searches gave me this.

I’ve never heard of that company, can’t vouch for them at all… just pointing out that these shouldn’t be too hard to find.

I don’t believe that the photo used is actually that of one in your size- it’s showing a wider aspect and a different bolt pattern. However, if the shape and finish are good for you, it ought to work fine.

I believe those will fit and work fine.

 

I see no reason the Yaris wheels would not fit, they are not much cheaper than the new wheels I linked.

Used on ebay 378 + 58.50 shipping to you = $436.50
New on tirerack = 437.36 + 23.18 tax to you = 460.54

You may or may not be able to move the TPMS sensors between wheels, I am no expert on that.