From looking at the photos on Google, it's quite the variety of stuff they carry: Computers, bulk wire, security cameras, ham radios, components, etc.
On the Nose
During the con...Yep.You've done electronics work, haven't you, Kogasa-san!There's a big electronics parts store here in Okinawa too!You've just got to go check it out!
Okinawa Electronics, Inc.
Electronics Specialty Shop