You may find more quad strollers available, I never see triple ones to be honest. Why not look for quad's as if your numbers increase or you get more little ones, you would need to upgrade again. In the meantime you will have an extra space for a small cooler or diaper bag. I find kijiji is the best place to look or multiples websites. Otherwise, maybe take a weekend trip across the border and have one delivered to US address. Its 10 minutes across the border at Niagara Falls and is an extremely cheap service.