Yes. I will also investigae on FBM as well. I do believe that a 3PL would be less expensive than FBA.
What I heard is that if we use a 3PL, that 3PL needs to be very good. Otherwise, if the 3PL strats to miss those delivery deadlines (i.e., having delays on deliverys), it will hurt our listing and ranking. Amazon will put the fault on us. On the other hand, if the delay is caused by FBA, Amazon will let it go. And that is what I worry about FBM.