The value of a 300 dollar Apple iTunes card in Naira is currently determined by the fluctuating rate of the US Dollar to the Nigerian Naira, which can vary significantly depending on the time of day and the specific foreign exchange platform you utilize.

Typically, you can expect the exchange rate to fall between a specific range, but it is crucial to verify the live rates on a reliable digital marketplace to ensure you are getting a fair deal without falling victim to scammers who offer inflated prices.

As a technical professional, I recommend that before initiating any transaction, you carefully review the vendor's transaction history and the technical security measures in place to guarantee that the code will be valid and the payment will be processed instantly.