If you want to buy something by less price you can use verb "indirim yapmak".as above said. or else you can use this sentence."Biraz daha indirim yapmanız mümkün mü ?". It means "Is it possible to make some more discount?"

do you mean bargaining? we say "pazarlık yapmak" if the seller will make a discount, it is called "indirim yapmak"

no I mean getting something in less price or say to the seller give mi it by less price