Several I have wanted have been out of stock, but were in stock on Indigo online and in their stores. When I want to buy a certain book, I'm buying it from whom

Several I have wanted have been out of stock, but were in stock on Indigo online and in their stores. When I want to buy a certain book, I'm buying it from whomever has it. I love Amazon, I bought several of my christmas presents off of them and I've spent a small fortune with Amazon, however if they don't have what I want in stock I'm going elsewhere. I'm sorry, but if a brick-and-mortar store can have several copies in stock at several stores, why the hell doesn't Amazon have it?