Hi Kerry,
On N332 between San Javier and San Pedro del Pinatar, besides the DFS (http://www.dfsspain.com/) which Gina already mentioned, there are also 2 other large furniture stores:
Castor: http://www.castormuebles.com/
La Orca: http://www.laoca.es/laoca.asp
In the new shopping center La Zenia there is also a furniture store called La Conforama: http://www.conforama.es/index.php
If you like modern furniture, collection "Urban Chic" in the department store El Corte Ingles is very nice, modern and some of the price is very affortable. http://www.elcorteingles.es/tienda/hogar/
Regards,
Wendy