popping candy freddos are less syns than the normal ones if they tickle your pickle.
Cholate buttons are good too, weigh out how many you can have for say 5 syns (work it out by the nutritional info on the back going by the 20kcal =1syn) and keep them in individual bags so you can just grab and go. I think they last longer than a bar because you can eat them one at a time.x.x.