Do you have a brand name (like ILCO) and number for that blank they used? Run of the mill key blanks are pretty cheap but they seem to really hit you up for a "motorcycle" key blank, even though, chances are, it's just a normal blank.
What I was trying to say in my 1st post is Yamaha dealers have (or can get) the blanks, they just charge the same whether they cut it or sell it to you blank. Some racket, lol.