Those prices do sound high. I've been told that because of Cash for Clunkers, the used car market is lacking in product. I didn't think that was possible but I've been contacted by my local Toyota dealership and offered $15,500 for my 2004 Sequoia Limited 4x4. I've never had a dealership call and offer to buy any vehicle before.
Again, I think those prices are a little steep. If they're not, it might be time to sell.