Is this a bargain?

I see the page but there is no Buy Now button so perhaps someone bought it already?

Yes, I noticed..someone got a heck of a deal or it's a call in to order?

What about my query- can the cart be dismantled from the headshell?

ART1000 $5K  "lightly  used" for half is a steal.

To my ears, on a proper setup it's in the uber cart league.

Never saw or heard one. I'd like to compare it to my AT33PTG/II. Significant cost difference, 

Of course it can be removed from the headshell, but that doesn't make it your best choice, their AT33PTG/II has channel separation 30db and channel balance 0.5db performance specs that are identical, thus stereo imaging capabilities are matched, yet the impedance/output is quite different

ART1000 says impedance 3 ohms, (recommended load 30 ohms: the 10 x coil impedance guidance formula); signal strength 0.2mv;

AT33PTG/II impedance is 10 ohms, 0.3mv, thus guidance says try for around 100 ohm load.

always check the specs, see if your SUT or phono MC stage has the right combo of xFactor and perhaps separate impedance settings.

my SUT, 4 optional xFactors with resultant impedances: to keep impedance near 30, you would use the input which is an xFactor of 36, resulting in a load of 37 ohms, thus it would output very high, too strong 7.2mv signal strength into my RIAA Phono input.

Using it's optional xFactor of 21, signal strength would be 4.2mv, but the resultant impedance load is 110 (ideal for my AT33PTG/II), 

Apparently it's been sold, but I've heard the AT-ART1000 and it's in an entirely different tier of performance compared to their AT33PTG/II or their other carts in that range. The ART1000 uses a unique magnetic system with the moving coils positioned more directly above the stylus tip rather than at the back end of the cantilever, giving it a more direct drive system and much better dynamics.

@bill_k Very correct. It is also a very delicate setup that will not survive any misstep. My tendency would be to avoid it.