Expect GNX-like pricing on these buckets when you find them at a vendor. Only a GM part and warehouses were still overflowing with them just a few years ago...
Someone OR some company has bought them ALL in the past couple of years. There were tons of them in GM's inventory just a few years ago, like pre-covid. OPGI showed them in the 2020 catalog for --sticker shock--- about $100+ each catalog page pic below.
in just the past few years, these parts have disappeared from many vendors.
The Parts Place lists them as available - "to inquiry for pricing" which translates to an expectedly high price tag just like their $829 cam sensors.
junkyard sounds like your best bet. it's tough today to find as years go by. with limited real estate, not too many yards keeps a few 80s cars around...