Just look up “Bluetooth speakers” on Google. You’ll find lots of them.
They come with a little USB-to-Bluetooth adapter. You just plug it in one of your USB holes and you’re in biz.
They usually don’t come with a bluetooth adapter. You can buy a bluetooth 4.0 adapter (the latest version) for about $10 on amazon. They are little USB dongles. Then get any bluetooth speaker you want.