While I completely agree with TCups about the usual quality of the scopes and mounts that are bundled into promotional sales, I gotta say, I actually look for those packages...
Sure, they're usually not up to the quality of the gun I'm buying, but I have piles of Crosman and Daisy pumpers that really shine with bargain scopes and rings. Also, it's nice to have a few 4x32's laying about that I can lend out when one of the kids (my nieces) gets a new rifle, or drops her gun on a cinder block (which has happened twice).
That out of the way, let me say yeah, you should get the right scope for your gun separately.
-JC