So I had to look them up: best price was $84 on eBay ($65 plus shipping) for OEM shipped directly from Korea. Others were around $100 to $125 which is what I had heard previously. Just wanted to make sure I wasn't stealing them!
My 2019 Niro came with hubcaps over black aluminum wheels. I didn't want that standard setup, so I bought new aluminum wheels and sold the 2 piece setups. There has been no difference in handling, noise or mileage/range and the wheels look much nicer. Got them from Tire Rack and had them shipped directly to the dealer for install at no charge due to the fact that the sales rep never told me the car had hub caps. I assumed all new cars in this price range and fitup had aluminum wheels. Shame on me. Kia changed it up later.