いくら can be used for asking how many things there are, but it is most often used when asking how much something costs.
How much is this car?
What is the price?
How much money do you have?
■ いくらでも as much as you like; as many as you want
9 お菓子は、いくらでも取ってください。 Take as much candy as you'd like.
■ いくら～ても no matter how (much or many) [use with the て form; takes a negative verb]
9 いくら泣いても、あげない。 No matter how much you cry, I won't give (it) to you.