FRU or field replacement units only go down to the keyboard in most models. If you want a single key you go to Ebay or such.
As to your claim about not buying, since all laptop and desktop keyboards are like this, I worry there are no companies that will make you happy.
In closing I replace the entire keyboard and the cost varies with the unit. From 12 bucks to at most 99 bucks for the fancy backlit models.
I contacted Dell to inquire about a replacement key cap. One key cap! I was informed that they don't supply single key caps, ten, or all of them. What I could do is buy an entire keyboard, and take the key cap I need from that to replace mine, or install the entire board. An entire KEYBOARD? Alternately, I could get a replacement board for no cost if the Inspiron 17" laptop was still under warranty, and met the conditions of said warranty. So, my options are: pay a keyboard price for a single key cap, or maybe get a new board under warranty for free, if I want to deal with packing it up, shipping it to a service center, and wait without a laptop for how long? All this for a 5 cent piece of plastic Do they all do this? Come replacement time, I WON'T be buying another Dell.