I asked earlier this week about that, this was the response:
We have been informed that new negotiations for Restaurant Depot is being worked on. At this point we have not had any confirmation as to when and if it will be available for our members. The best I can offer is to check back from time to time on the website in the KCBS discount section once you have logged in and check for all current discounts. All sponsorships and discounts are not handled directly through the KCBS office here but by a advertising company whom KCBS has worked with over the last several years.
Manager, Member Services