There are many 2006 Odyssey saling for $15000 and less with a perfect record of operation - means no accedent.
Check your local Craigslist postings.
$15000 for a 2006 Odyssey is not a good deal, it is probably the worst deal you can get for a salvage title Odyssey. Do not forget the dealer fee, surcharges, and other ripe offs often the dealer will throw at you.