I think there are many in ebay? about $10?
Sorry to piggy-back on this thread...how about a PCI(e) WiFi AC + Bluetooth? Anyone using any of such?
Edit: Sorry, i'd found one :http://www.amazon.com/Gigabyte-Bluetooth-Expansion-Components-GC-WB867D-I/dp/B00HF8K0O6
Anyone using it?