Jon Courson Essential Bible Study Library $34.95http://www.logos.com/product/8649/the-jon-courson-essential-bible-study-library
$39.95 http://www.logos.com/product/10164/courson39s-application-commentary-old-testament-volume-1$39.95 http://www.logos.com/product/10165/courson39s-application-commentary-old-testament-volume-2$34.99 http://www.logos.com/product/8583/jon-courson39s-application-commentary-new-testament
I don't think I've ever seen an explanation (well, maybe once), but this isn't 'unusual'. I think it has to do with an older contract, and then upon breakout, a new contract (with new higher prices). The good part is that the older one can still be purchased.
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