"can you offer some discount on this TV?"
or
"I would buy it today if you can offer $xxx discount"...
hohoho
or say "I can get it mail order at $xxxx, but I prefer buying
from you if you can match their price or offer some discount"...
whatever you come up with...
it's easier to negotiate at circuitshitty and sears. at worstbuy
they probably have to ask a manager.