Less than $100 for San Fermín, eh? Hmmm.. that'll be tough, I'd imagine. Have you conducted a SEARCH of this forum using, simply, PAMPLONA
as your keyword? That should sprout a bunch of previous threads on the same topic from past San Fermines.
Many people finding themselves "Shut Out" of an overbooked Pamplona choose to bus in from San Sebastián-Donostia. I think it's about a 1-hour bus ride and lodging will be more available...until all those who where SHUT OUT in Pamplona took up the same idea and books lodgings in "San Se".
Best of luck! Hope you don't end up sleeping in the park.
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