I always ask - "are you open to offers" on anything for sale outside of a store or "is that the best price you have" when in a store, but only if doing the deal in person. If they say yes, I'll politely say "don't want to insult you with my offer, but would you take xxxyyy?"

People are usually pretty receptive/polite with this approach, and I've been pretty lucky with it.

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.