The venerable Micca MB42s [amazon.com]
are going for as low as $33-35 (Used - Very Good/Like New) after 20% discount at checkout. Normally go for $60.
Pair these with an amp such as this [amazon.com]
, or one with Bluetooth [ebay.com]
, and you've got a pretty sweet desktop/workshop speaker system for ~$60-$80. Also work great as surrounds.
Woofer - 4-Inch Carbon Fiber
Tweeter - 0.75-Inch Silk Dome
Crossover - Filtering capacitor on tweeter
Enclosure - Rear ported, wood grain vinyl
Frequency Response - 60Hz-20kHz
Power Handling - 75 Watts (Each)
Sensitivity - 85dB 1W/1M
Dimensions (inches) - 9.5 (H) x 5.8 (W) x 6.5 (D)