The $15 price tag doesn't actually surprise me being Stern and all, but if they are touting one of the reasons to move to LED being MTBF (longevity) they should be replacing any and all LED failures for free for the life of each pin they sell with them.
If the user wanted to change the stock LED out for another colour, then sure $15 each all day long. (which is still absurd as Stern's cost per board with LED installed will be under $1 each, and if they claim anything different they are lying to you...)
D