I don't mean to cause any confusion, but since I've just remembered a similiar question that recently has been posted here, I'd like to copy David L.'s reponse to that post:
'a number of' is regarded as a 'determiner' when used with plural nouns, and so the verb is plural: A limited number of memberships are still available.
Actually, I would agree with you, banderas.
But:
Is it possible to say "There is" but rather unusual, or is it wrong?

