if you don't mind any shop, i had good experience (Lenovo brand laptop) with a shop in Muntazah. the shop is across the road (Muntazah Street) from the Al-Meerah in Mansourah - the name of the outlet escapes me for now. it is the first shop across Muntazah Street, between the Al-Meerah in Mansourah and the shops in Muntazah.