Dual 4" mid bass driver Edifier D12 $149
Or Klipsch The One $159.
However a pair of Edifiers are around the same width so you are not really saving much or any space over the single speaker options unless you get a smaller portable speaker.
Edifier powered speakers:
A pair of speakers gives you stereo separation for stereo imaging and sound stage.
Or the Andover Spinbase can be placed under a turntable. However it costs $299 and may not sound any better.