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The ones on eBay for $500 are non OEM. They're reproductions, and I believe you can get them for use with or without the JBL system, just be sure to read the description. I've read mixed reviews on them, some think it's excellent, some hate it, so if you're willing to take a risk then go for it, and let us know how it turns out!
As far as it voiding your warranty, it won't. The units on eBay are 100% plug-and-play, so if you have concerns about it, just swap your old unit back in before heading to the dealer.
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