Why is Need for Speed: Most Wanted so expensive?

I know this is probably one of the best games in the series, or atleast it is my favorite. I have bought this game for ps2 but i never played it on the ps2 cause i got bored of games at the time. Then i got an xbox 360 and got the game NFS MW. Then i returned it and bought it again a few times then returned it cause i didnt want to keep it because it was so expensive.....$34.99 for a 5 year old game.Does anyone know if this game will ever go down in price?I want to buy it and keep it but since i dont really get money alot and i have to use my own to buy things i like to save it up