I think it was for EZD also. As I remember I got a few 6pks for each EZD and EZK at the time and just let them ride while they came out with new stuff, ala Bapu!!
I do remember when they announced they were going to increase the price of the 6 pks. That's when I stocked up on what they had at the time, and have sat back and waited for sales to grab others. I don't think I ever bought any 6pks at the $100 range.
So until now I only had two EZB midi packs that I got on sale. Until today.