Baker Encountering the Bible Series (8 vols.) is currently not showing dynamic pricing correctly:
It says it's showing dynamic pricing, and indeed the price shown on the product description page is less than the regular price by 43%:

But I already own 7 of these 8 books:

There is no way $122.37 is a fair price for the last of them that I don't own yet, especially since that book sold by itself goes for $29.99. Normally, with dynamic pricing, a single missing volume can be picked up for a bit less than the stand-alone price. That's what I'd expect here. The regular price for this set ($214.35) divided by 8 yields $26.70. So I would expect the dynamic price for someone who owns everything in this set except Encountering John would be somewhere between $26.70 and $29.99.