Welcome! Try and locate MP SOundwave in TRU's locally, but since it's been a while, most of em might have been bought or scalped ( damn scalpers) already , but if you want to get all the tapes in one go as well the Hasbro one is sold cheaper than the Takara version,with not much difference other than the red/yellow eyes between the figures - but yeah Hasbro's release has all the tapes and is much cheaper priced as well.

Good luck with the hunt. MP 10 will prove to be a real challenge though...