South Karolina....
QHF, quill hair and ferrule
if you order send in a wish list, cause they always call back and only have about 1/2 the brushes i need or would like to have.
Mack is a good place and the others mentioned like Rayco or Hyatts. some college art sites carry some sign brushes, brown or gray quills tip you off they aren't the " bob ross" variety , but meant for the control mopping 1- shot requires for a nice consistent and smooth look. the vinyl weenie folks use photoshop brushes.
Zman.the rookie.
clean them out with MS, then pat dry and dip in oil, trans fluid will work but Walldog oil is better so they never get hard and you loose a good investment. hand work the oil into the hairs down to the ferrule. you really can't over oil them. and lay them flat between use so they don't loose the form you prefer or need .