I spent about $70 at Oriental Trading (there's a free shipping + $10 off coupon code online) for 100 dessert plates, 100 dinner plates, 100 napkins, a card box, a roll of plain blue plastic table cloth, two "grad" table clothes for the cake table and one other one, a yard sign that says congrats grad with space to write my daughter's name, and two bags of "grad" confetti to decorate the tables.
Serving bowls will be bought in her class colors from dollar stores (and will be useful afterwards, too) and other than ordering the cake and a thing of mini-subs from Jimmy Johns, I'll be making all the food. (We are having a mid-afternoon party so no "meal", but snacky things and the little subs.)