We actually bought the stuffed birds and pigs as a coming home gift when my husband and I returned from a week long getaway. Then we stopped by Home Depot and bought one 3/4 inch pvc pipe, a T and a couple of elbows. My husband cut the pieces down to size and put together the sling shot. We just tied some plain ol' rubber bands together and put them over each side. Then for some extra stability he drilled a hole in a two by four and stuck it down inside.