Expiry: Mar 29, 2023
You can get up to 80% bonus or 45% off your Aeroplan points purchase when you buy points before Mar 29, 2023.
Price for 80% bonus: $3500/180000 = $0.01944/point
Price for 45% off: $3465/180000 = $0.01925/point
So, as you can see, the 45% off option is slightly better.