Real Techniques and EcoTools Brushes are buy one get one 50% off at Ulta! You can also stack the $3.50 off $10 coupon with it, so you'd be getting an awesome deal. Ecotools has a ton of great little kabuki brushes.

These eye brushes are really good for on the go, but you should peruse the whole site -- they have free shipping for this whole month! You might get a better deal at Ulta though depending on how much you're buying.

EDIT:

If none of the above interest you, I browsed Amazon and found these brushes that had pretty good reviews! The Coastal Scents brush set you mentioned also looks pretty good for the price they have on the site!