Audis generally don’t lease very well; I’d say $199/mo with $999 down is actually an anomaly.
Here are the numbers for A3 1.8T Premium:
58% residual, 10,000 mi/yr (+1% for 7,500 mi/yr, -1% for 12,000 mi/yr)
.00068 MF
$500 Lease Cash
$750 Audi Loyalty Cash OR $500 Competitive Owner Cash (BMW, Lexus, Mercedes, Acura, or Infiniti)
From doing some reverse math, the ad assumes an MSRP of $32,050 and a selling price of $26,750, before the $750 Loyalty Cash. Bear in mind that the actual drive-off amount will be greater than the $999 down payment, as you’ll have to add first month’s payment, acquisition fee, doc fee (FL dealers are famous for high doc fees), taxes, and license/registration.
A discount of nearly 17% is superb for an A3. Looks like a great deal if you can get it!