price guides like the SCD Standard Catalog of Baseball Cards will give you an ideal of their value.
What set(s) do you think would be "lesser known"? Do you have examples?
IMO If its collected as a set it is probably well known, most of the lesser known sets (ie E222, T214, D303 Mothers, etc.), are not collected as a set but rather as "type cards" because a complete set is so tough or is unknown (not all cards discovered yet).
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