Hi,
Dubai has an electronics souk where you can buy ATMega8 chips and everything else you need to make a standalone board. I am sure Saudi has the same shops, in Dubai they are all around the satellite Market and my guess is that they would be in a similar area in Saudi.
for your first board it is much easier to buy a Ready built UNO, it will make programming any boards you later build so much easier.
Your nearest distributor is in Jordan, you can find the details if you search around the main Arduino site.
Duane B
rcarduino.blogspot.com