What is the easiest way to get Aya Warframe?

I'm curious, what is the most straightforward and hassle-free method to acquire Aya Warframe? Is it through completing certain in-game challenges, purchasing it directly with real-world currency, or perhaps there's an exchange or trading system within the game community that makes it more accessible? I'm looking for the path of least resistance here, so any insights you can offer would be greatly appreciated.