I assume you are talking about the business strike clad S mint quarter. as far as I know the mint didn't produce them, only in clad proof and Silver proof (in addition to the P and D ones.)
The mint didn't even produce a PD rolled set of them but you can get bank rolled ones
This year I've gone through 3 bank boxes and maybe a dozen customer wrapped rolls (looking for 25Ds which I haven't found) and not one 21S. I'd say, time wise, ebay would be the way to go.
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