According to the message from Matt:

Hi Everyone,

We’ve received word that LEGO retail stores are going to be offering a Pick a Brick case sale from April 27th through May 7th. Has anyone been to the store recently and heard of this offer? Is anyone stopping by Crabtree or Concord in the next couple of days and can perhaps see what the inventory might be?

“All LEGO Brand Retail stores, North America only, will offer an opportunity for AFOLs, who are members of a Recognized LEGO User Group (RLUG), to again purchase PAB elements by the case. All PAB cases will be offered for either $50 USD / $55CAD. This initiative will begin April 27th and run through May 7th during regular hours.

Each store has a different number of cases available and the selection will vary by location. Although we understand the importance of planning, lists of what is available per location will not be shared ahead of time and please do not make phone enquiries as the staff will not be able to provide you with a list.”

Thanks,
Matt