Most people would prefer to purchase their home theatre speaker that already comes in a full set which include surrounding speaker, subwoofers and a good A/V receiver and DVD player. Buying individual might be more expensive and something gives you more headache if the requires sound did not match the speakers.
Now you can get a nice full set home theatre speakers set with a very affortable price at most home theatre shops or you browse through internet online to get the best buys or the latest set on the markets. I just brought a full set of home theatre set for a few thousand Malaysian ringgit at my new home. The sound was fantastic with a subwoofers, two large home theatre speakers and two small one, A DVD set with all the requires receiver.