I'm commenting, but don't have any experience with leasing.
I've seen deals posted on deal websites regarding promotions. Typically, I read through posts to attempt to get an idea of what a good lease deal is. Personally, I keep my cars for 10+ years, so leasing doesn't ever work out in my favor. I put 12k miles on my vehicles annually and just don't drive fancy enough cars to require a lease to mitigate risk. (The only reason I could imagine doing so)
Check some of the deal websites out there and see if they have car sections you can search for recent posts. The last one I saw on the site I frequent is from November about Buick and suggests using Costco to get a rebate and Autotrader.com to locate new dealer inventory. I'm sure there may be other sales on the horizon as the year chugs on.