Are you looking for Stewartia? They are tough to find, and likely to be much more expensive than $10. If they are hardy in your area, you might check your local nurseries for landscape trees to layer or make cuttings from. Other sources to try, though not all show availability:
International Bonsai:
You can buy Stewartia monadelpha orange bark stewartia online mail-order. Stewartia monodelpha is a beautiful flowering stewartia. A purchase of Stewartia monodelpha is a true investment in your yard! Stewartia monodelpha is the orange bark stewartia. Buy this Stewartia monodelpha orange bark...
mrmaple.com
https://tupelobonsai.com/services/. Contact
@Owen Reich as he is a fan of the species.
Mine came from here, but he doesn’t ship. Your location isn’t in your profile, but he is NE of Atlanta:
Field grown Trident Maple, Stewartia Monadelpha and other trees for Bonsai,especially grown for bonsai. Large trunks and good taper.
www.tridentmaplesource.com
Stewartia has several varieties, ‘
pseudocamellia’ is a larger-leafed, variety. ‘
Monadelpha’ has smaller leaves. Good luck