It's Sephora brand "Tricks of the Trade" eye primer and it's only $12.
I have hooded eyelids, so creasing is a major problem for me. And, I also have somewhat oily eyelids which doesn't help my eyeshadow wear very well.
So, I've been using this for a few days and have thought it was working well, but hadn't really paid close attention until today... I applied this before my eyeshadow at about 7:00 this morning. It is now almost 6:00 p.m. and my shadow still looks fresh. Not a crease in sight, either.
I've tried Benefit's EYeye before and didn't have the same success. It does have a colo to it, so it may not work on all skintones but I would recommend trying it. It's the kind that you click the bottom up and the product comes out of the brush. I then apply some to my lid and use my finger to spread it around evenly.
I'm ordering some for a friend as part of her birthday gift.