This (forum) banner ad mentions discounts up to 50% off, but the L8 library expansions sale is up to 30% off.
https://serve.faithlifeads.com/www/delivery/ck.php?oaparams=2__bannerid=6660__zoneid=31__cb=7352e2037e__oadest=https://www.logos.com/library-expansions?utm_campaign=promo-library-expansions&utm_source=faithlifeadnetwork&utm_medium=advertising_internal&utm_content=728x90+zone-31+1906libraryexpansions
Alternatively, the banner could be correct and everything else could be wrong. [;)]
They are up to 50%, admittedly less than 50% but still up to 50% in Logos logic.