Philips SPA7210/17 Multimedia Speakers 2.0 for $19.99.  Select free site-to-store for in-store pickup at Walmart to save on shipping.  Otherwise, shipping is $2.97 for a total of $22.96 shipped.  Here is a screenshot for your reference.  It features deep bass and crisp sounds with 40W output power.  Most places have this speaker for about $35.