$120 for a decent camera? Well, depending on how you define "decent:" Even the Lumia line might not be able to satisfy on such a tight budget, at least at retail pricing.
You're definitely going to have to explore refurbs, eBay, Amazon, or anything else similar to get "decent" camera quality.
Pick up an old iPhone 4 or Lumia 900 if you ///REALLY/// don't care about OS, and just care about an ok, decent, good enough camera.
Both will never again receive any new updates (aside from something along the lines of a super critical security patch), so they're stuck as-is.
But if you're someone who really isn't into the smartphone aspect of your, well, smartphone... Then I believe both wield cameras that many would agree are simply, "Ehh, good enough."
I'd still recommend something more modern, if possible, like the 7XX series or 8XX series. And while great phone options: The 5XX and 6XX series really start to scrape the bottom of the barrel in terms of camera optics, being ultra-budget devices, after all.