Meritline offers the refurbished HP Compact USB Stereo Speaker Set, model no. BR387AA, for $9.99. Coupon code "MLCK726JNL1" drops it to $6.99. With free shipping, that's the lowest total price we could find by $5. (For further comparison, we saw a new one for $11 in May, since expired.) These speakers measure 2" and are USB powered. Coupon expires July 28 or after 100 uses.

Of note, no warranty information is provided