What is 5 USD in AVAX?

Excuse me, could you please explain how one would convert 5 USD into AVAX, the native token of the Avalanche blockchain? I'm curious about the current exchange rate and how the process works. Is there a specific platform or service that I should use to make this conversion, and are there any fees associated with the transaction? Additionally, I'm wondering if the value of AVAX fluctuates frequently, and if so, how does that impact the conversion rate? Thank you for your assistance.