We sell replacement dongles. The price is $30. To purchase one please e-mail us at CustomerService@AntlionAudio.com.
Alternatively, you can also use any aptx-Low Latency Receiver. Please note it MUST be a receiver and not a transmitter. To our knowledge Antlion's is the only USB receiver on the market, however there are third party receivers that use 3.5mm, RCA, and other analog outputs, which may work within your needs.