Its at 48% off right now ($285).  If you are a 8.5 owner already (or I guess that means 8.1 Pro), its another 50% off ($142.50)...and if you are PC, then another 40% off (~$87)

If you are not PC member, its cheaper to join, versus spending $142.50, as the PC Club costs ($24) plus the PC discount ($57) totals around $110