I have been looking to book something for the same weekend and it looks like the malls will be busy because there is limited availability. The ones near Walden Galleria that I know to be nice are Holiday Inn Select, HI Express, Hilton Garden Inn, Hampton Inn, Homewood Suites and you can walk to the mall from the Millenium. There is also a Comfort Suites that we recently stayed at that is clean, has a pool and serves breakfast (cereal, bagels, make your own waffles) If you are using Expedia you want to search in Cheektowaga to be near the Galleria Mall and Amherst puts you right near the Boulevard Mall but still only a 15 minute drive to the Galleria. Happy shopping!