They have flat shipping rate of $7 for entire order and lots of cookie cutters and other supplies. Maybe order them now for next year? Or check out some other cutters for your niece's birthday treat?
4mm = ~1/8" diameter
http://www.coppergifts.com/cookie-cutters/pc/Sugar-Pearls-Multi-colored-Matte-48p5044.htm
4mm = ~1/8" diameter
http://www.coppergifts.com/cookie-cutters/pc/Sugar-Pearls-Multi-colored-Matte-48p5044.htm