I called the boutique this morning, and the SA who sold it to me is off today so Im going to call her again tomorrow.
I asked the person on the phone about being able to exchange the bag once more Classic jumbo caviar black with ghw comes in (because I bought the last one and they're all sold out at other locations) and she said she doesnt think my SA would mind putting aside a new one for me once they come in, which should be about end of the week. Im going to call her back tomorrow to confirm though but i do feel better hearing that.
I also asked if i would have the pay the difference IF by any chance the price increases before I do my exchange and she said no, it would be a straight exchange.
However the store credit/ exchange policy in Toronto is 14 days so any thing past that, they can't do anything for me.
Maybe try talking to a different SA , i don't know Sak's policy ( we don't have any Saks yet) but since you are doing an exchange, it should be okay if the bags come in within the time frame of your policy.