What are PCGS SAMPLE SLABS WORTH?All input appreciated.

I have access to about 10 with circulated 1921 or 1921-S Morgan dollars in them,all are OGHs.
Great coins are not cheap,and cheap coins are not great!
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Are the 21-S ones noted as such on the label? If so, they are rarer (is that a word?) and somewhere in the $75 range is reasonable.
If you have one callout on the label but a different mint mark on the coin, you could get north of $100 on Ebay. I believe the 1921 label / 1921D coin is the rarest combination.
All of the 21S labels I have seen actually contain a 21S coin.
Hope this helps.