Its per KG from a scrapper at exotech.com. They advertise verified 99.99% but who knows. Its high priced actually, but it would be high to turn a profit selling small lots to chemistry teachers and such. Metal.com shows about 90$/kg for niobium. Might be a fun way to get some niobium and scandium for desk toys.
scandium however is 10$/GRAM or 10,000 per KG from that same seller. Prices are all over the place of course for scandium.