Although the t-shirts and onesies are usually pretty affordable (about $18), every now and then they host a sale where all the designs are $10 each- and that time is now- from 24th of November untill the 28th, 2011. They also have $6 shipping if you spend $75 or more, so if you're looking for a place to get cute t-shirts for your little man or lady (or if you have kids to buy for) now is the time to stock up.
Hunter rocks a fair few threadless shirts and onesies. I would say the quality of the workmanship is near identical to American Apparel shirts in every way: same smooth soft jersey, not to heavy weight (like a kookai shirt) but not thin either (like Ksubi or Ben Sherman); well sewn necklines and sleeves; and true to size between the range. These qualities can be so elusive when online shopping. As a side note the babies onesies all have those faux-raglan sleeves which make getting a big and/or uncooperative baby noggin in the shirt so much easier.
Here are some super cute designs, all available in the kids section of the online store.