Low cost upgrade for 2005 scion xa audio system?

I just bought a 2005 toyota scion xa and the stereo is horrible. No base whatsoever and doesn't go loud at all. I'm looking for a low cost way to upgrade the audio. I don't need anything fancy I just want something half decent. My last car was a 2003 honda accord lx and the stereo in that was just fine for my taste, if that gives any clarity as to what I'm looking for. Hoping to spend less than 200. Any suggestions?

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