Cheapest lease for a lexus IS?

I have never done a lease before and with the way may current old car is doing, I think it is time. I definitely want to lease as I will buy a new car im about 3-4 years. The car I narrowed it down to is the lexus IS. 2016 or 2017. I am willing to wait a few extra months if things are cheaper in the late summer or fall at around September or October. Can anyone tell me how low I can get monthly payments on a lease if I pay a down payment of $3000 for 12000 miles/year? I am not a professional at haggling unfortunately. I am curious to know your experiences with leading from lexus or honda.

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