Professionals can request an Educational Kit, which comes with a sample pair of SmartKnitKIDS socks and informational brochures to hand out to parents.
The socks are a tube shape, so there is not a seam at the heel.
Here is a close-up of the toes (on my hand, because I couldn't fit into the kids XL :)
The prices start at $6.95 for a pair of children's socks, which seems a little pricey, but if you have a child who truly cannot tolerate wearing socks, it is probably money well spent.
SmartKnitKIDS also carries socks for big kids, seamless AFO socks, seamless undies, and seamless undertees.
***I am in no way affiliated with SmartKnitKIDS. I just think that they have a unique product that more people should know about.