pass it through a rolling mill.
Yes, you can use 2 in series, IE daisy chain them to add up to 8 ohms.
For stereo you would need 4 speakers not 2. mono, 2 not one.
Most Amplifiers work OK driving to a lower impedance loads anyway so just hook them up. Very high power levels may overheat the amp but at normal volume it should be fine. Something important is added: There are no 8 ohm amplifiers! The amplifier will have an output impedance of around 0.04 ohms. In hi-fi we have always impedance bridging. Zout << Zin. That means that the output impedance of the amplifier is much less than the impedance of the loud speaker. The damping factor Df = Zin / Zout tells you what Zout is. Zout = Zin/Df. If the damping factor Df = 200 and the loudspeaker impedance is Zin = 4 ohms, the output impedance of the amplifier is Zout = 4 / 200 = 0.02 ohms. You see, there is no "8 ohm amplifier" with a 8 ohm output. Scroll down to related links and look at "Voltage Bridging - Zout < Zin".
Stereos use basic left and right speakers. In 4 channel stereos the add in 2 more channels to move the sound around you. In 5 channel surround they add a center channel for voice coming from a picture generated in from of you. Helps pull you to the person talking on the screen. 5.1 utilizes this and then adds the .1 which is an effects speaker, the subwoofer. Then you feel the roar of an engine taking off.
Try Ebay at www.ebay.com. It's an online auction service that has probably a few million or more subscribers. They also have a `want it now` section for members where you can post extacly what it is you're after.
Hope this helps,
Compoent video cables themselves aren't made of gold, but they can be gold plated. Gold plated connectors allow for better conductivity. The cables are typically made of oxygen free copper.