Amen!
Parts prices always have been all over the map, and sometimes just don't make sense...
I'm reminded of something that happened during the restoration of my car, which took place at a firm (now gone) called Precious Metal Restoration in Grand Rapids, MI. It had started basically as a 190SL restoration house by one who was quite well known in the 190SL crowd at that time, Rich Splaine. Rich sold the business to one of his body guys, and that's when I brought my car there.
ANYWAY there were a number of 190SLs in the shop some awaiting restoration, some looking much like barn finds. One was waiting on a new right fender, but the new left fender was there waiting for all the parts to arrive. The right fender eventually became in stock at a price about 2x of that of the left fender. How does that make any sense?
Well, Mercedes-Benz at some point in the past had contracted for a run of R + L fenders, and they were priced according to their formula. When after X years, the right fenders ran out, they re-contracted for a run of R fenders. That, being years later commanded a new cost, and thus a new price to the consumer. The fenders that had been in stock had the old price.
Honestly you never know what and how things happen...