I think this has come up on several occasions in different scenarios with dynamic pricing. I've even asked the question of a sales representative, but it seems to be a mystery. Hopefully the forum community can answer ...
As far as I can tell, I own every single resource listed in this collection (Ancient Philosophy Research Library]. Yes, all of them...even the presentation media. I went through the list and compared with my library.
Yet, the webstite is saying that I could own it even more so than I already do for $7.20. ... and last month I was able to own it for $6.12.
I've asked Faithlife via e-mail several times what the difference between what I think I own and what is offered in that collection, but it would appear that I have "stumped the band". No response whatsoever from the sales department.
Anyone have insight?