AA means it has A grade venier on both surfaces.
Marine grade means it has no voids (hollow spots) in
the inner plys. Marine grade implies nothing about the glue
used....
Fir plywood is usually a little cheaper than mahogony.
Luan is the cheapest mohogany.
You can call the 800 number for any one of number of
plywood sources (like Flounder Bay in Anecortes WA)
and learn even more.