I got a second hand Sony speaker in pretty good condition for 30 bucks (an sbx-xrb-31 or something like that - Sony uses stupid names). It's an absolute hoot. It has LEDs and features a "rave mode"
I thought it was a bit bassy, but also quiet, but apparently it has an "extra bass" mode which i figured out how to turn off, and when it's under 20% battery, it halves the volume
I've got a speaker from this era of Sony and it's still going strong. Cool is a good setting to avoid those big light flashes if you want the party lights on