Party City has a selection of traditional made of foil and paper centerpieces that feature the celebrated person's age, as well as cartoon designs. Real Simple also provides many birthday centerpiece ideas.
Real Simple offers 20 different centerpiece ideas that take five minutes to make and feature flowers, fruit, candy and even cocktails that create a higher-end look quickly without a big budget. Beau-Coup is another great resource for party decor that, while inexpensive, has a higher-end feel that can make any birthday party Pinterest-perfect. They have a great selection of table decor as well as fun and festive garlands.