Box in Forum Algarve should have hard drives.
Alternatively, you could try:
Worten in the Modelo centre in Olhão.
See type of stock here at their online shop:
http://www.worten.pt/ProductList.aspx?oid=10|26|124|&c=1428759&l=1
If you can get to Algarve Shopping in Guia, you can go both to:
Vobis
or
Fnac
They both stock hard drives.
Finally, if you really in the East of the Algarve, you could nip over to Ayamonte and see todoapc.com who are in old downtown Ayamonte.
They have been in business for several years.
http://it-solutions.todoapc.com/
One note:
Be clear what type of hard drive you need - IDE or SATA. The latter is the new standard and will not connect to older motherboards without an additional pci card.
