Lake Louise and Moraine Lake look unreal in July and August. The water gets that brilliant turquoise color as the glaciers melt into the lakes. If you want to see them without paying peak summer surge pricing at the last minute, you need to lock in your plans before spring wraps up.
A solid week in Banff usually costs around $2500 for flights, lodging, and a rental car. Instead of dropping that cash all at once, you can spread the cost over time without paying extra if you play it right.
Keep in mind that an intro window is a strict deadline, not free money. If you still have a balance when those 15 months end, the standard variable interest rate kicks in on whatever is left. Set up an automatic payment of $166.67 every month so you finish paying it off right on time.