You guys need to understand how S&W makes their guns. Because they are not a custom shop, they build to large batch orders. So, when your local place, even if it's a big box store, puts it on "order" for you, you have to wait until that store gets their big order in. It's not like they order them one at a time.
So, another store will have been already waiting 6 months for their order of guns to come in. When you place your "order" the other store happens to get theirs in. Thus, it seems like one place has a way to get them when another doesn't. This isn't true. It's just being in the right place at the right time.
Now, if you were to order a true custom gun, like an Ed Brown or Les Baer, when they say X months, it will be close because they make guns one at a time.