@ShanieBerthelot you can also sign up for notifications https://productioncommunity.publicmobile.ca/t5/Plans-Add-Ons/Re-How-to-get-notified-of-ANY-New-Promo...
@ShanieBerthelot how much are you currently spending and what plan are you thinking of getting?
Depending on the difference you might save more by starting now than paying more and waiting for a deal.
From personal experience, best deals of the year seem to be during
1. Black Friday
2. Boxing Day
3. Back to school
4. Mother's / Father's day
But as @mimmo says, why wait if you can start saving today.
Also prices tend to go up. If we take chatr as our indicator of what plans/price will be, 40$ for 2.5gb and $50 for 4.5gb and no 10$ plan, current offering are on lifesupport.