The sale is only on drivers up tp level 80:
"Get 20% off drivers in the Pro Shop now through Mon, 9/2.
This long weekend is a great time to upgrade your virtual driver to hit longer, more consistently and more accurately off the tee.
Don't miss this weekend's flash sale – just log on to WGT to buy any virtual driver (up to Level 80) for 20% off the regular price"
Bjorn.