Bundle Monster via Amazon offers its Bundle Monster New Pro 20-Piece Nail Art Tool Kit for $14.13. Coupon code "47CMOCNL" drops it to $5.65. Plus, Amazon Prime members bag free shipping. Outside of the mention below, that's the lowest price we could find for such a set by $3. It features a variety of brushes and dotting tools with a roll out bag.
A close price: MotorEasyBuy2012 via eBay offers a comparable set for $5.99 with free shipping.