Head over to Kmart for the buy one, get one free toddler sleepwear sale! Most of the PJs are around $9.99, but I spotted some for as low as $5.99. Just add two items to your cart, and your discount will be taken automatically.
If you send $59 on select apparel at Kmart right now, you can also take an extra 10% off with the code MERRY10.