It is simply their price at which they make a profit, because if you look at the price for which they buy and sell, then you can clearly see that the difference is about 1500 CAN dollars, which is again about 1000 CAD dollars more than the average price you would pay if you were buying on some CEX. Such crypto exchanges that are of a local type and do not have a lot of liquidity usually have much higher prices than those globally positioned.

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Every "normal" crypto exchange will allow you to withdraw your coins to any wallet, including Ledger. There are some services that offer the purchase of cryptocurrencies, but do not allow users to withdraw them to their wallet, but that's why you should always read the terms of service (TOS).