I almost closed the browser tab.Not because I didn't want to go to Paris, but because I had just priced flights for two adults and an infant during Roland-Garros (the French Open), and the total was approaching $7,000 — for economy.Planning my son's first international trip across the pond wasn't exactly shaping up to be a budget-friendly getaway. Fortunately, I had other tools at my disposal to bring the cost down.I recently added the Chase Sap…