Martini & Rossi Asti is a really good affordable Sparkling wine..
Make sure you know that the bottle will say sparkling wine, unless it is from a particular area of France it can't be labeled and sold as "Champagne" but the end produce is still a carbonated wine..so you're not getting ripped off or sold a knock off.
Drop a couple of Raspberries in the glass after you poor it.. they look pretty and are tasty to eat as your sipping the wine..
Best of luck