I am going to do some house renovation and plan to buy spools of electrical wire. I wanna seek where is the legit place to buy real cable being Sirim,JKR certified and with 100% copper as per claimed?

What is a typical price for wires:
1x spool 100m 2.5mm2 - usually how much RM?
1x spool 100m 4.0mm2 - usually how much RM?
Any recommendation which shop to buy from shopee/lazada/online?