The value of a $300 Amazon gift card in Nigerian Naira can vary depending on the current exchange rate. Exchange rates are constantly fluctuating in the foreign exchange market.

To determine the exact amount, one would need to check the prevailing exchange rate at a given time. Financial institutions, currency exchange platforms, or online financial news sources can provide the most up-to-date rate. For example, if the exchange rate is such that 1 US dollar is equivalent to a certain number of Nigerian Naira, then multiplying that rate by 300 will give the value of the $300 gift card in Naira.

It's important to note that exchange rates can be affected by various factors such as economic conditions, central bank policies, and global market trends. So, the amount in Naira for a $300 Amazon gift card will not remain static but will change over time as the exchange rate fluctuates.