You can purchase ULTRA from these places
Go to Kucoin.com
The People's Exchange
Go to Uniswap
Uniswap is a secure platform that makes it easy to buy, sell, and store cryptocurrency like Bitcoin, Ethereum, Stellar Lumens and more.
Go to Bitfinex
The largest and most advanced cryptocurrencies exchange
Go to Bithumb
Bithumb is one of the largest exchanges in South Korea, allowing users to buy/sell/store Bitcoin and Ethereum.
Go to Coinone
Coinone provides various blockchain and cryptocurrency related services, including cryptocurrency exchange center and foreign remittance.