You pay to list your item and have to pay that fee whether the item sells or not.If it goes on to sell, you also have to pay what they call a final value fee.The fees vary widely, depending on the price of your item and what category it falls under, so the only way to see how much it is likely to...
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You may get lucky on Ebay but I doubt it.
No because it is expensive.
There are many for cars but for trucks I'm not sure.
Speakers are the weakest link in any audio system. Always buy the BEST speakers you can afford. You won't be able to hear the difference in lower priced electronics but you will in lower priced speakers.