Lulu is best for electronics, for basic reason that it has the wide variety compared to others, thier customer service (sales guys) are the worst in the market.
As far as you query is concerned you know what specific item you wanna buy, so wide variety doesnt matter for you, just availability matters.
Call these numbers and tell them to connect to electronics section, and they will tell you price, no need to visit them.

Lulu (D-Ring-44667780), (Gharaffa-44074000)
Jarir, 44440212