I want to ask for a reduced price on an item that has been listed for months, don’t know how to ask without sounding cheeky?

I want to buy a dance costume that’s being sold on fb marketplace for 300. It’s been up there for many months and I’d like to ask 250 for it. Does that seem too cheap? How to ask without seeming cheeky?

I want to ask for a reduced price on an item that has been listed for months, don’t know how to ask without sounding cheeky?
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