Since Sportzone closed at Chiado a year ago, there are no large sport shops in down-town Lisbon (Baixa). There is a large FNAC store for electronics, books, cameras etc at Chiado.
For ease of access by pubic transport, I recommend going to either the Centro Colombo shopping mall, Metro Colegio/Luz-Militar on the Metro Linha Azul (Blue Line) direction Amadora Este or the Centro Comercial Vasco da Gama shopping mall at Parque das Nações/Gare Oriente, accessible via the Linha Vermelha (Red Line) direction Aeroporto or by suburban train from Sete Rios, Entrecampos, Areeiro or Sta. Apolonia staions. .
At both these locations, there are large Sportszone.pt sport outlets, as well as worten.pt and fnac.pt outlets which offer electronics, mobile, books, etc etc.
Mediamarkt.pt have an outlet near Centro Colombo and Staples.pt have one near Gare Oriente.
