if I sign up today, and after the stabilization will I still get intro prices?

A clarification, please read it

https://fizz.ca/en/faq-stabilization-period

What will happen to my price after the stabilization period?

For members who will have subscribed BEFORE April 12, 2019.

Once the stabilization period is over, your plan will return to its launch (introductory) price. Please note, however, that if you change your plan after the stabilization period, regular prices will apply. You will be notified of the end of the stabilization period one month in advance.
 

For members who subscribe ON, OR AFTER, April 12, 2019.

Once the stabilization period is over, regular prices will come into effect and will therefore apply to your plan. You’ll be happily surprised by these once the stabilization period has come to an end. You will be notified of the end of the stabilization period one month in advance.