While Amazon.com is an authorized dealer for some Yamaha products, some sellers on their marketplace are not, so you should always confirm that the seller is authorized by Yamaha.
In this regard, how much does a Yamaha upright piano cost?
Upright Piano Prices
You can find a Yamaha upright piano for around $4,500 (they go up to about $19,000), and entry-level Steinway uprights start at $25,600.
Considering this, is Sweetwater authorized by Yamaha? The expansion was the result of Sweetwater recently becoming the exclusive authorized Yamaha piano and Clavinova dealer in the region, including northeastern Indiana, Northwestern Ohio, and South-Central Michigan.