The people at my local craft store never know anything either!
"Where're the bamboo knitting needles?"
"Do you have bamboo knitting needles?"
"Oh right...they're over here."
"But these are aluminum."
"What do you want?"
"I don't think we have those."
(they ended up being on the very next aisle!)
Not to mention, if I go over to the fabric section, there'll be a person there usually looking at a magazine, and I'll be standing there for quite a while, clearing my throat, tapping my fingers, trying to get their attention, and they never look up. Finally I say "Um, ma'am?" and they practically turn into a rabid wolf for disturbing them!!!
This is why I order my yarn online.