Good coffee beans.
Grass fed beef and pastured eggs. :
Eileen Fisher clothes. Sometimes.
And I spent what seemed like a lot of money on Wacoal bras a couple of years ago, but they are made so much better than the VS (and actually support my DDs) and they have lasted really well.
Things I'm frugal about: generic contact lens solution, buying dish/laundry soap on sale, lots of clothes/shoe/bag shopping at TJMaxx and Marshalls.