A self-purchased eye primer I absolutely need

I highly recommend the Urban Decay eyeshadow primer that I bought with my own money and have been using consistently for years! I purchased it about two years ago on a friend's recommendation, and there was definitely a huge difference between using it and not using it. Before using the eye primer, my eyeshadow would be completely worn off when I looked in the mirror after coming home in the evening, but after using it, it was amazing to see the eyeshadow still perfectly stuck to my eyes. Haha. So, I have been using it ever since. Personally, I think it is a bit on the expensive side for an eye primer, so I always buy it when it's on sale... It's too expensive to buy at full price.