Where can I find a cfl bulb?

Ok more specifically, I have a Plantation Home that came with a fan with lights in the bedroom, now one of the bulbs has burned out. I tried calling my builder who had no idea where to send me, and none of the local hardware or lighting stores carry this one. It is a 4 pin kind of pear shaped not spiral and not tube bulb on the plastic plug in part it has this as an identifier viva pla13w 3000K cri:82 and on the other side it says v642. With all this information you would think it would be easy to find but I have had no luck!! Hopefully someone out there can help! Thanks...