Start a toy rotation system. Pack up and store approximately half of the toys. Keep one of each kind out and store the others (e.g., have 2 shape sorters? keep one out, store the other). Every change of season (or when the kids start to complain of boredom), pack up the toys that are out and pull out some of those previously stored. A toy rotation system is a wonderful thing. It keeps kids interested and keeps parents happy because it saves money and reduces clutter. A win-win.