Can't say i ever had a problem with "aa" in Canada.
Just had a few shirts from them delivered next day that i need to show a client as samples for a job. Paid single shirt price and im ok with that.
As for BestBlanks, they are sponsors on a few sites I manage and they are a pro-company. Dont know why you are having problems.
I think what you are going thru is something called B/O " Back Order". It is normal in the biz.
Mind you that B/O percentage should be minimal on fills.