They sell bitcoin for 6000 dollars more than it's worth. Ethereum is a bit lower rate. Chainlink for some reason is pretty high rate. Anything that is objectively the lowest from crypto exchanges that you know of?
There are a lot of crupto exchanges as well as coins out there. The possibility of getting a lowest price from other exchange might be possible but I assure you that it will be average to a certain point. You can check on coinmarketcapcap data about current trading price. If you are planning for an arbitrage make sure that the exchange you are gonna use is small in fee to take advantage of it.