You can fly into Santander (Ryanair) and get a bus from the airport to Bilbao and then get a bus to Pamplona, or fly to Bilbao (Aer Lingus) and bus to Pamplona. Either way would be quicker than flying into Biarritz.
A cheaper guide book is Walking the Camino de Santiago by Gerald Kelly. You can get it on Amazon, the maps are b/w, but the is a lot of info in it, and it's a lot cheaper. £4.04
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