Red seems to be a big color too, but then who doesn't like red? Black and white are popular, but around race time they are always big. Lots of patterns, and geometric shapes are a hit for this year too.
I like the selection at stores like the one pictured, Styles for Less. Forever 21, Blue Echo, and Macy's have a nice selection of affordable trendy fashions too. I did find some electric blue at Express, and if you want to hunt you can try Marshall's and Ross. If you are willing to pay a little more Nordstroms always has a good selection.