Small items and pictures the markets are good, espeially the Monday one in Pilar
Also shops like Casa Casa and there is one in Torrevieja and one on the commecial centre at Cartagena Parque Mediterean
Cushions and vases etc also look at New2you in Torrevieja, they sell both 2nd hand and new items
Garden furniture, depends on the type, good rattan ranges at Leroy Merlin but the best and cheapest wuality supplier is Hnos Garcia, 3 stores in Torrevieja, one close to Carrefor, one in the Avde de Valencia just past Iceland where there is also a Casa Casa
Small electrical items MediaMarkt, there are 3 locally Elche, Murcia by IKEA and agian Cartagena