Where do you buy batteries in Al Nahda without getting ripped off?

[jacintocollier]

My wife's car needs a new battery and I'm trying to find somewhere convenient near our place. I've heard prices vary a lot depending on where you go and some places charge way more for the same battery. Looking for a Reliable car battery shop around Al Nahda, Sharjah that won't overcharge or sell me something that dies in a year. Has anyone bought one recently and what did you pay? Also do these places usually test the alternator before selling you a battery or is that something you have to ask for? I don't want to replace the battery only to find out the alternator was the actual problem.