UD is having a deal where if you buy two eyeshadows you can get the free build your own palette. and free shipping.
It's $18 and comes with a shadow (http://www.urbandecay.com/urban-decay-build-your-own-palette-eyeshadow-case/329,default,pd.html?start=18&cgid=12) So a pretty good deal if you've been thinking about doing this.