Army PX stations what do they sell.?

What all do the PX stations on base sell? if It helps at all I'm being stationed at Ft jackson for BCT and Gordon for AIT. I'm going in as B25 (information and technology specialist) So i'm sure I'll be allowed a laptop since I'm working with computers (correct me if I'm wrong). And I was curious what all the PX station sells. Computers? cell phones? I know they sell MRE's. Can you keep those in your barracks? Are the AIT barracks still group barracks? Fort Jackson BCT Fort Gordon AIT. thanks in advance.