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It is difficult to get RELIABLE figures for the VX - (one reason) because of the low number that are sold - so you can just about forget the figures you find from the normal sources ........... KBB ..... Edmunds ...... etc. Few (if any) dealers will 'adhere' to them when the VX is concerned.
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With 15K to spend - you may be limited to a private party search. Probably a 99 also.
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Never say never - but there is a *extremely* minute chance you will find a clean 00 or 01 VX for 15,000 from a dealer - especially with low miles. Prices for the VX's have risen at auctions during the last year or so - and some used car dealers will pay close to published retail figures for clean VX at auction (especially if they have a potential buyer).
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The fortunate ones were the VX buyers in late 01 that purchased their VX's for thousands off sticker - and have the full factory warranty.
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btw: don't forget - some VX's that dealerships get were leased.