A cheap set of PC speakers. For $14 you can get a great set of USB powered PC speakers that will blow you out of the room and sound very good. Search for Amazonbasics.
Mark
536/436/WS1095/HP1/HP2/996T/996XT/996P2/396XT/325P2/PSR800/15X/others
I agree with Mark, got a great set of PC speakers from Staples for about $14. Thin so they don't take up a ton of room and sound great. Use them with my BCD436HP.