during my early school days, i used to do and create my own by using old xmas balls and buying styrofoam balls at the national bookstore... It should be arranged and crafted according to the planets different sizes... i think no bookstore offers a completely built set... ituhog mo na lang sa bbq sticks bawat planet and planted into a huge styroboard... baka naman makalimutan mo pa ilagay sa gitna ang Sun hahahaha.... slightly tedious doing this but sometimes this kind of project brings in the word "father and kid" bonding time... goodluck boss on this endeavor...