There are many vendors here on pricescope who can help you. What they can not do however is provide you with a consistent interpretation of AA or AAA. Unfortunately there is no industry standard, so one vendor''s AAA might be another vendor''s B. Sadly, when there are no standards, every B stone becomes a AAA in order to compete so the whole thing becomes relatively useless.
You can call and talk with many of the vendors here and get their input on what you are looking for and you will have no trouble finding these stones.