At South Pattaya Road is the "Tuk Com", a shopping center on 6 floors only for mobile phones, computers, software and accessories.
Like in many other cities in Thailand you will find "Gold - shops" at nearly every corner.
Also there are many Mini Marts like 7-Eleven and Family Mart which are open 24 hours daily.
The big Thai Markets are Thepprasit Night Market and the Soi Buakhao Market.