With availability limited by ZIP code, Kohl's offers the Carter's Baby Boys' Coveralls 2-Pack in Woodland & Striped for $13.99. Opt for in-store pickup to avoid the $8.95 shipping fee. That's the lowest in-stock price we could find by $3, outside the below mention. It's available in sizes Newborn, 3 Months, and 9 Months.
Note: Quidsi Retail via Amazon has a couple sizes for the same price, but stock count is limited.