Where are you in central Oregon? Bend/Redmond? Eugene?
You are under age so you parents will have to buy the gun for you.
You have a couple of options.
Your parents can take you to a local gun shop. Ask the shop if they will order a gun "cost plus 10%". (Some will do it for less. Some will even order for a $25 paperwork fee just to have you back as a repeat customer.) Have the shop check Davidson's. They usually have the best prices and can order exactly what you want.
You can also go to a local gun club where they have "cowboy" shoots, "silhouette" and other type matches. Most gun clubs have members that have their Federal Firearms Licence. They will also a lot of times order you a gun for cost to get you interested in their club.
Good Luck. Great choice.
Steve
P.S. I grew up in KFalls. I know what its like to want guns at your age. I was lucky I had parents who were great enough to teach me how to use them properly, let me use my paper route money to buy a few, and then take me out often to shoot them.