Two Mandarin words made huge difference

Assalamualaikum to all..
Just wanna share my experience purchasing some stuffs for my dissertation project..

About 5pm just now, after finishing preparing my raw material for concrete to be mixed tomorrow, i went to a hardware store to purchase steel hook..wanted about 8 in numbers..

Got my right foot into the shop, an old Chinese lady asked me,
"Ya, mau cari apa dik?" (Yes, what u looking for?)

"Owh, sini ada jual handle tak?" (Oh, do u sell handle here)

Then, she calle a middle-aged man, think was his son..

"Yes.."

"Sini ada jual, itu handle ka?itu letak dekat pintu punya.." (do u have handle here? use to put at the doors)

"Ini ka?" (This?)
-showing me a latch

"Bukan, itu lock, ini handle.." (No, its a latch, i want steel handle)
and the handle was right next to the latch..
and i said,

"ha, ini lah.., u ada yg besar punya?" (Ha, this is it, do u have a big one?)

"Ada, ini lah.." (Got, here it is) by showing me a bigger size, in a plastic showed "RM5"

and those magic to Mandarin words i use was,
"Duoshao qian ah?" (Berapa ringgit? / How much one of this?)

"Yi ge ah?" (One of this?..er..wait ah..)
He went to the cashier to ask his assistant, maybe..

while waiting, i calculated myself, supposely, one handle cost about RM2.50..

then he came back and said, "saya bagi RM1.00 saje lah.." (I give u RM1.00 only)

"owh ok, saya mau lapan" (Owh ok, Give me eight please)

and the conclusion from this, how those suppliers can give way low prices if we can speak their language..
Here in Malaysia, most of them, when i spoke with them in Mandarin, the tendency to get lower prices or discount is quite high..

had before, i dont know how and dont want to speak in Mandarin, they hardly give discount
on not even 10cents..

so, i was totally surprised today, from RM2.50 can be down to RM1.00..
thats only for a unit..how bout if i ordered about 100pcs..RM150 i can save..