If you don't mind what game is in the bundle, there's the Xbox One S Minecraft Favorites Bundle (500GB) going for $247. I'm a racing games kind of guy, so I'd get the Xbox One S Forza Horizon 3 Bundle (500GB) for $50 more. Other places seem to have about the same price points for bundles.
Then there's Craigslist if you'd prefer ¯\_(ツ)_/¯