In New York City, everything (except your square footage) is bigger. Including your grocery bill. And though you’re all for saving money, the bulk-buying trek to Long Island City isn’t easy with kids in tow. Which is why you’ll love Big Box Deliveries, which brings diapers, formula, and food from Costco right to your door. The online service is simple: Shop by room (pantry, baby’s room, home office) and load up on items for next-day delivery. Each product has a “Costco price” and an “average NYC price” that’s based on current rates at stores such as Food Emporium. If you buy 30 rolls of Charmin in NYC, you’ll spend $42.18; at Costco, only $20.19. Big Box Deliveries splits the savings, so you pay $31.19 — for a total TP savings of $11. No schlepping. No long lines. And your monthly budget won’t get wiped out. Available online at bigboxdeliveries.com. GIVE Fourth Annual Babylicious Room to Grow Toy Drive What: Donate nearly new clothing, books, and toys for kids in need (0-5 years); get 10 percent off all new purchases. Why: And that’s one to grow on. When: Thru July 31. Mon.-Fri., 10 a.m.-6:30 p.m.; Sat., 11 a.m.-6:30 p.m.; Sun., noon-5 p.m. Where: Babylicious, 51 Hudson St., b/t Duane & Jay Sts. (212-406-7440). DANCE Preballet for Kids/Pilates Express Tower Class for Moms What: Tiny dancers (3-4 years) learn the basics of ballet; you work on core strength, flexibility, and your upper body. Why: Flexible for all. When: Tues. & Thurs., 3:30-4:15 p.m. Where: American Youth Dance Theater with Elite Body Pilates, 428 E. 75th St., b/t First & York Aves., 2nd flr. DailyCandy Kids readers can reserve at 212-717-5419. HEAR Ladybug One Songs with The Harmonica Pocket What: A mix of music and dance — plus a Hula-hoop and a ukulele — makes for a fun performance. Why: Buggy down. When: Sun., 1-2 p.m. Where: Central Park, The Peter Jay Sharp Children’s Glade, inside the park at 106th St. & Central Park West (212-860-1370).