SAVE $$$ off of individual prices off the individual items ScentBall Aroma Diffuser, Replacement pads, 4ml each of Lavender, Super Essential oil, Mint Energizing and Citrus synergy blends. All for the special price of $19.99 Replacement pads for Aeron Aroma Diffuser (Pkg of 5). The heat source for diffusers can come from tealight candles or electric outlets. The simple to use is a must for any household. It can be used in any room! And is great to take with you when you travel..