I went to a local Yamaha Dealer to check the price on some of their Clavinovas. I was told that their prices were already on "seasonal discount" off MSRP. The CLP-240 was $2800, and the CLP-280 was $4800.

I've seen from the forums that there's generally room for haggling. But I can't really compare prices because there are no other dealers in the area. Do these prices seem reasonable, or could there be room to haggle?

I live in Seattle, so tax would add about 9% more.

They seem expensive.
Here in Italy you can buy a CLP240 for around USD 1900 equivalent and the CLP280 at USD 3600. Both tax inclusive.
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i think that price is a little high, and people reported to have bought a 280 around $4500 or lower. so, i'd shop around at different dealers and get the best price, if i were you. btw, the sales tax sounds really high in your area.

I ended up getting the CLP 240 for $2400 plus tax. Tax is a killer on large goods like this one.