We have several guild members across my main 3 guilds that have the ambrosia recipe and they usually make it for free for members ( i always give the a few xp pots or roes to keep anyways).
I'm guessing that is part of why the market has come down and will continue to go down even further.
I got plenty of bervez juice and frost mirriam (8 lvl 50 master chefs with 3/3 hirelings) and perfect roe isn't that rare either.