Q Are there any items that will let me send music from my laptop to my receiver, wirelessly, using some type of USB connection?
You’re probably looking for something like this Onkyo piece:
There’s tons of this stuff available - look under the keywords of “USB audio wireless adapter”
VidaBox: Digital Entertainment & Controls
Blu-ray & DVD Movie Servers | Audio Servers | vAutomation Touch Screen Controls
Just get an Apple TV and use iTunes. You will need an 802.11n Wi-Fi system for the music stream is consistent (otherwise your steam will skip) and both Apple TV and your computer must be on the same VLAN.