Target offers the Gerber Unisex Baby Onesie 5-Pack in White from $7.99. Opt for in-store pickup to dodge the $4 shipping charge. That's the lowest price we could find by as much as $2, outside of the price below. They're available in sizes newborn to 24 months.

A close price: Gerber Childrenswear charges $9.99 for most sizes with free shipping for Amazon Prime members.