Fronts are 265/35R20 Rears 305/30/R20 and came in at £972 inc the piss poor balance, Hunter balance was £96 at the specialistBlimey! what size are your tyres?
I bought 4 PS4S's, admittedly just over two years ago, 255/35R20's, and including £85.00 for 4-wheel Hunter alignment, I paid £752 inc VAT.
I've only done about 10,000 miles since then, but I'm not expecting them to last much longer and I'm hoping prices haven't gone through the roof.
More on topic, I wouldn't change them for any other brand - superb grip wet or dry .