I'm talking actual / realistic negotiated prices, that other forum members have realized in 2017 on PP BRZ purchases. Low to mid $28k on a PP was possible in 2017. Now that it's 2018 , it may be closer to $29k …. right about.
Check some links on here, research only costs time :
http://www.ft86club.com/forums/showthread.php?t=119291
Yes, there are some slight regional pricing differences , but that thread will give you a good idea.
As for the '18 tS pricing, really it's too early to know exactly how much to expect to pay. The 1-2 forum members have put a down deposit on one, but sounds like $34-36k …. roughly.
Still, its about a $7k difference between PP and tS ….. roughly (could be closer to $7500 after taxes). All rough estimates, I'm not a Subaru sales rep.