Etymotion BT is a Bluetooth Module with AKM Velvet Sound DAC and an Amplifier made specifically for Etymotic IEMs delivering wireless experience to your favorite pair.
It costs $180..
ADV EARTUNE FIDELITY U are hypoallergenic silicone IEM tips that promises ultimate sound isolation, comfort and no changes to sound whatsoever. Pack of 3 can be picked for $25.