Yeah look at the sticker on the door for the date of production. Determine how many months it's been on the road for. How many miles does it have?
The residual value for a BRZ Series.Blue after 24 months with 20,000 miles is 59%. That's 17,868.15 from an MSRP of $30,285. Obviously the car isn't two years old, but if it has 20,000 miles you can use this as a negotiation tool.
Also, the invoice of the BRZ Series.Blue when new was $28,763. So I wouldn't pay more than that.
If you average the invoice & the residual value you'll get $23,315.58. I'd say this is a fair price especially because it is a limited edition car and hasn't even been out for a year. If the car has low miles, expect to pay 10-20% more than this.
Here's some pricing reference:
http://www.cargurus.com/Cars/l-Used-...es.Blue-t56038