PerspectX prices changing?

AlienRenders

There were some items at 70% off. I went to purchase them and noticed the price had changed from the previous screen. So out they go for now. Why is the price changing on the fly?

 

Graze

The 70% off discount was an error.  It's only suppose to be about 45% for the Work Hard Play Hard sale.

http://www.daz3d.com/06-05-work-hard-play-hard