You can try looking for flats rented by private individuals. If you are travelling alone I'm not sure how prices might work out but it's worth looking at. I recommend this site: www.segundamano.es/li…

Although the majority of the adverts are in Spanish, try sending an email anyway as you are bound to find some English-speaking owners.

Another useful site is www.mundoanuncio.com. Click on the "Zaragoza" and "pisos" option.

Have you tried this webiste? It might have some hotel options you haven't tried: http://www.aragonguide.com/

The Sabina apartments come highly recommended.

Lesser-known (though smaller) hotels just incase you haven't tried them are:

Rio Arga

Hotel Conquistador

Husa Via Romana

Hostal Cataluña

Hotel Inca

Hotel Tibur

Hotel Partner Romareda

Hotel Catalonia Zaragoza Plaza

Try this website which also has hostels as well as hotels, you might drop lucky: infohostal.com/guia/…hostales.htm

Have you thought about staying in a nearby town/city and travelling in to see the Expo? Huesca is one option. Or looking into finding accommodation in other parts of Zaragoza such as Casetas which has a good bus service into Zaragoza centre.

thank you - I'l give those sites a try

I came across this site today, don't know it it is of any use to you at this stage, but here we go:

www.niumba.com/zaragoza-apartments-p52-1.html