It depends on your budget. Zara Home have beautiful bedspreads but they are expensive. Try Marks and Spencer or BHS for something a bit cheaper.  Alternatively you can try Souq Wakif or the Najma area for something more reasonable. I bought a lovely bedspread in Souk Wakif for a fraction of what something similar would cost in Zara (similar quality too!).

Hope this help. Happy shopping!