A good pair of jeans, heck just bought two pair last night for my son and the night before that I bought two pair for me.
I can NEVER have too many pairs of jeans (I wear them quite literally 6 days a week, so I've got a couple dozen). When I find a pair that not only fits well, but makes my butt look good? I buy every pair I can get my paws on.
ETA: Oh yeah, and word of a good bra or shoe sale will perk up my ears pretty quick, too!
this thread made me think about my wardrobe, and I've been wearing the same 10 Honda racing / Fox shirts for the past 2 years. I guess I can't pass on outrageously discounted jeans. most of mine are $20 and under.