Come on, really? Seems like all the NAC volumes are on sale for $7.99 except the first Corinthian's volume. Is this a huge mistake or is it really not on sale; if not on sale, then why not? This is not a complaint but I'm just wondering why all the volumes, except for 1 Corinthians, are on sale? It makes no sense. Maybe an oversight as usual. I hope it is because I'm only missing that volume. I'd rather pay $7.99 than $19.99 per dynamic pricing 
DAL