Walmart has the QFX 8" Portable Bluetooth Loudspeaker with Mic. (PBX-8074) for $34 with free in-store pickup or $5.99 shipping to home. List price: $60. Features 4,400-watt peak power, adjustable treble and bass, LED lights, USB port, microSD cart slot, and 3.5mm input, up to 4 hours of music per charge.
eBay has the Pioneer Elite F4 Powered Wireless Smart Speaker (Black, VAFW40) for $59 with free shipping.
Amazon has the Onkyo SKH-410 Dolby Atmos-Enabled Speaker System (Pair) for $75 with free shipping. Has good Amazon Reviews.