How to go about purchasing objects with player score/points?

Point me in the right direction? Thanks!

A little more explanation: Trying to set up my game to where, with points/score earned, the player can use this as currency to purchase a displayed item, not in a menu, they just walk up to it, press a certain button, and wallah!

If I were you, I would make a script attached to the item that counts the money/points the player has with a variable and the price of the object, like this.
If the player touches the item and the money he ha is more or equal to the price, he will buy it!

var points : int;
var price : int;

function OnTriggerStay(other : Collider) {
    if(Input.GetKeyDown("p") && points >= price)
        //put stuff when he purchase it