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andy beckeri have the same issue. i collect more obscure issues.....what i do is look for a like player common/hofer, within the same set, that hopefully has a recent sale and then extrapolate.
this works if you are not looking for a rare card within a set, say o'hara stl t206 as an example.
even VCP is just a guide and reference. you still need to know what the intricacies of the set are and you still need to use some judgment.