All indications ate that MP Soundwave hasn't even had its main release at Retail TRUs, so saying it has come and gone and is worse than MP Prime is premature and not very factual.
Nowhere got more than 4-8 SWs, one or maybe two shipments per store. But almost all stores show larger shipments coming later in September.
In the Canada area there were never enough. Mass number of those went to Asia area where there are more populations....And they know to short their supplies with these (kind of) collector items so that they can re-runs them later to keep up the hype....
For the last few MPs I could see only Rodimus in Stores...none others...
And I truly doubt that I can find a MP sound wave at our local TRU, I was a one store thy guys said they had 10 on shelve and all gone in one hour. So unless you got their workers help or you are truly lucky to really see one on shelve.