[70LonghornCST]

One thing to consider is that GM made replacement parts well into recent years. Many parts such as taillight bezels, lenses, door handles, certain styles of trim, and many others were made in large quantities and are still pretty common, but demand a higher price from buyers who understand that even though the stock is seemingly abundant, it is finite. Many speculators noticed past trends of other NOS parts, and how they went up in price drastically after being discontinued, and purchased--as said by leddzepp--as an investment. What you are seeing is large caches of stockpiled NOS parts being difussed thoughout the market.