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There is a Saint James (notice that it turns into "Saint Jacques" in France) bureau in Lourdes, Boulevard de la Grotte, 16. The guy in charge was happy to see a fellow "jacquet" and very helpful.
My personal lodging picks:
Betharram, at the monastery (the entry is not obvious, it is a
narrow passage just facing the old stone bridge). Roomy, comfortable, private or communal dorms.
Arudy (one of my best experiences in my Caminos),
parochial presbytery, rue Baulong 2, last round point before the church.
Oloron Sainte Marie: Relais du Bastet (attention, many guides don't have the phone or the persons in charge right, it is currently managed by an association). It is a medium city, there are many options and services.
Hôpital Saint Blaise, public. It is a minuscule village.
Monreal. Gîte municipal, 7 rue des Frères Barenne. Ask in the Tourism bureau or the city hall, main square. It is a little city; also some hostals and hotels.
Saint Just Ibarre, I stayed at a farm-albergue of Family Etcheberry,
1 km before the village. It does not appear in guides. I discovered this wonderful and warm place from a sign in the panel of albergue municipal of Monreal.
Also, there are other albergues in the village proper.
Saint Jean Pied de Port. Lots of options, as you know. I stayed in the parochial, the "Accueil Kaserna". Good feeling.
If you are looking for a moment of quiet spirituality in Lourdes, I recommend that you
visit the parish, by main square. It is also dedicated to the miracle, in a sober and dignified way, and has very interesting sculptures.