This is possibly the coolest music video ever made!
The outgoing Commander of the ISS singing "Space Oddity". In space.
for general speaker repairs and service
The diameter is a nominal figure. It refers to the measurement from one edge of the speaker basket to the other. The nominal figure is often slightly smaller than the actual measurement - for instance a lot of 8" speakers are about 8 1/4" in diameter. On speakers with wide metal outer flanges or "squared off" basket trim, this nominal diameter will be slightly larger than the outside dimension of the foam or cloth surround.
Shipping will vary by weight, of course. I usually use UPS Ground. The ordering instructions explain this cost in more detail.