I forgot to mention, only the Source should be able to send to the multicast address. Also, the cost of a new multicast address should be negligible (e.g. $0.0

I forgot to mention, only the Source should be able to send to the multicast address. Also, the cost of a new multicast address should be negligible (e.g. $0.01). Instead, charge for incoming traffic on that multicast address from the Source.