Hi miralaluna! Welcome to our ALL SPAIN Message Board!
Have you checked with all the hostels (called "hostales" in Spain/Spanish) @
http://www.MadridMan.com/pamplona/pamplonahostels.html ? There, you'll also find a number of hostels
NEAR Pamplona where you may be able to stay for cheap and BUS into the city.
I imagine you'll have all your stuff with you so you might not want to stay in one of the youth hostels (called "Albergues Juveniles" in Spanish) but they'd be cheaper, of course.
Saludos, MadridMan
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