Scott, here in the USA, all of the PSR1500 and PSR3000 keyboards come to the dealers with the AC adapters included in the box. I have had customers tell me they didn't receive the adapaters and I have to tell them that they are in a seperate box, packed under the keyboard in another piece of cardboard, so unless you look for them really well, you might think they are missing.
The price for the adapter here in the USA is also about $50 or $60. This is high for AC adapters but I think the reason might be because these adapters can be used in all countries without having to push switches or use of transformers. The only part of the cable which needs to be changed is the end that plugs into the wall. This can vary from country to country and Yamaha has provided a plug which pulls out from the Adapter and can easily be purchased in whatever country you are located. Or, a simple adapter can be added if you don't want to replace the chord.
George Kaye
Kaye's Music Scene
Reseda, California
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George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)