I saw there was a thread for this on doing multi-city bookings with Aeroplan 2.0, but I haven't seen one for cash bookings.

I need to do a complex booking (YLW->AMS->BRU->BUD->OSL->YOW) throughout May. I've been able to get the AC website to price it out, but the AC website is not great for multi-city bookings and doesn't give any indication when selecting flights about how they will affect the final price.

For example, I got it to price these 5 flights at $9900; then I tried again and changed 1 of the 5 flights, and it priced at $13200.

Is anyone familiar with any tools that can help find the best flights to select to minimize cost for a multi-city booking on AC?