Buying XBOX360 and accessories in Rawalpindi / Islamabad

Eid Mubarak to all,

I need to know the best place in Rawalpindi/Islamabad to buy XBOX 360 console. I need the latest one with 250GB or 320GB.

What if I already have the XBOX360 and want to get it flashed/mod whatever to make it play local games available?

I also need to buy "Xbox 360 VGA HD AV Cable". Is it easily available in market?