This Cirago Bluetooth 3.0 High Speed and Wi-Fi Combo Mini USB Adapter looks like the perfect size, but unfortunately, is out of stock everywhere
I found this Bluetooth / WiFi Combination USB Dongle on Adafruit but I think it would be a tight fit in my case, depending on how big the pcb is inside of it. It just looks bulky from the outside.
There's also this HAVIT HV-WU725 150Mbps Wireless WIFI Dongle Bluetooth 4.0 Mini USB Adapter For PC,Laptops (Black) which looks good, I might give it a try.
Just wondering if anyone has had any experience with these combo dongles, or what you guys think about them.