Got a chance on a Leupy in the above mentioned size for 3 bills. Is this a good deal or no? I believe its got the AO and standard duplex.

I would say that the price you mention is within + or - 10% of average for this model.

For a further yardstick, you can check out ebay prices on this model. Ebay is a pretty efficient market in discovering fair market values for merchandise like this.