What am I the most frugal about?
Books and furniture. I see no reason to pay full price for either and will happily wait for a good deal. On the latter, I usually wait until I can find it free either by dumpster diving or freecycling.
Where do I typically pay full price?
Probably food--although I tend to shop at stores where I can buy the foodstuffs I want at reasonable prices. Also, I will opt to buy the ingredients to make my own foods rather than buy overpriced prepared foods, which saves.
Where do you go frugal and where do you splurge?
[Note: Picture above is of a quilt that I pieced and sewed for my kids' school a few years ago. All of the fabrics were donated by the children and I assembled them in a collage fashion around some childrens' drawings to make something that (IMO) turned out to be high energy and fun. I loved playing with all of the donated scraps of fabric and seeing the way they worked together--making patterns out of the randomness. The quilt cost very little to make, but seems worth far more because of each child's contribution and because it has "character."]