If you're looking for an authoritative source, I don't think price should be the primary criteria, especially when it's a relatively paltry amount.
That's not to say Wikipedia isn't a valuable resource, because it is, but the same things that make it so useful also tend to make it less reliable. Yeah, I know "real" encyclopedias have mistakes also, but it's not like you or me can edit the EB as a joke.
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