mwave offers the Pyle 100-watt 5" Midrange Speaker Driver
, model no. PDMR5, for $11.79
with free shipping
. That's the lowest total price we could find by $4, outside of the price below. It features 100 watts RMS (200 watts peak), 450HZ to 7kHz frequency response, sealed back, and more.
A close price: Amazon charges $12.43 with free shipping for its Prime members.