Fry's Electronics in the US (and perhaps their online storefront
http://www.outpost.com) often have complete systems available for $250, which include and are capable of running Windows Vista Home Basic (i.e. they're decent systems for the price). They ship internationally.
That said, Fry's is renowned for their liberal and sometimes scary return policy. Returned and possibily defective items are usually discounted and put back on the store floor. Not sure if they do similar things for their mail-order business.
Trev
