I’d call all suppliers first. If either of the remaining two say yes, then great (higher margins). Regardless of what the last 2 suppliers say, then they should call the distributor and try to get the remaining brands on board. When in doubt always contact individual suppliers first because distributors will take a piece of the cut... aka your margins... best to go directly to the source.
Hope that helps and please let us know if you have any other questions, thanks =)
Have a great day!