The price on the SPAS is about par for a hook stock folder. You won't be able to just go out on any given day and find one cheaper...
The Factory Folder Minis are cool guns (Like the kind the A-Team carried [:)]) and a grand is par for one of those too. I have seen them sell for more, I have seen them sell for less. While I am not a fan of the Mini system, for what it is, it is a reasonably fair price out the door for a Mini factory folder. Keep in mind that with anything "pre-ban" you are paying a lot for collectability, very much so in the case of the Mini Folder. They were never sold to the public- only to LE agencies. The only ones available are police trade ins, so there is a collectable aspect there since they are rather hard to come by in the grand scheme of things.
If it were me spending the 2k, a 870P and a Bushmaster can be had for $1100, saving $900 to spend on optics, goodies, and a shitload of ammo.
While the Grin Factory may be higher for the SPAS and the Mini Folder, they don't do anything a Bushmaster and a 870 won't do; some may even argue that they are lesser weapons.