Arabic sentences for the day

How to ask for price, and even bargain a bit, in a shop?

How much (price) for this?
هَذِه بِكم
hadhihi bikam
hadhihi - this (thing)
bi - for
kam - how much

That is for 30 riyals
هذه بثلاثين ريال
hadhihi bi thalatheen riyal
thalatheen - 30

It is little too much
هَذا عالي شوي
Hadhaa Aaali shuwai
Aaali - high

I will give you 15 riyal for this
بعطيك لِهذِ خمسة عشر ريال بس
baAteek lihaadhi khamsa ashara riyal bus
baAteek – I will give you (“ba” prefix indicates future)
li – for
hadhi –this
khamsa ashara – 15
bus - just

In that case I will buy later
بس أشتري بعد
bus ashtari baAd
bus – in that case
ashtari – I buy
baAd - later

OK, how much will you give for this
طيب, بكم تِشتري هَذِ؟
tayyib, bikam tishtari hadhi
tayyib – good (OK)
tishtari – you buy

I will give it to you for 40 riyal
بعطيها لأربعين ريال
baAteekha li arbaAeen riyal
baAteekha-I will give it to you
arbaAeen - 40