How do I purchase items

@brownstaar all you need to do is click on this link then select your proper model.

To illustrate how to do that I selected the MacBook 13" Unibody (Model A1278)

By clicking on it I get to

Here I can make further selections as to what model. Lets say I need the Unibody rubber feet

Clicking on the highlighted text

will get me to the product page.

On the bottom of this page is the Add to Cart link

I can now edit the cart by removing suggested items and leaving my order in the cart.

I can now either continue shopping or click the Checkout Now to finish shopping. Hope this makes sense.

For any further question you may want to contact the ifixit staff on here. The "Answers" forum (where we are right now) is not habitually staffed by ifixit, but by volunteers that are not connected to ifixit as a business