Please someone tell me

a) pearl shop, though they're not cheap
b) market (but nobody sells them)
c) some good news at last: while proceding with the quest you get a few (about 1 anytime you're asked to spend some to complete a task)
d) stamina will regenerate at a slow rate, but constant. life buffs will reduce stamina costs and reduce regeneration times.
e) one of the monuments you can build in your camp will give you an extra 50stamina/day
hth

Thanks