Aircraft cost changed?

I was eyeballing a DC-10 the other day and it was $8.8million. Today when I went to purchase it the price had jumped to $9.3million. why the change all the sudden? It would have been nice to get a heads up since I just blew an extra $500k

Prices vary with the age of an aircraft, so the one u have seen somebody else bought and a new one was put on the leasing market and that was a little younger then the previous one and so it costs more. Only when you buy aircrafts brand new they cost the same.