I have 2 "home made" by an electrician distros. They are set up to be a master and slave, but can be used as two masters (the slave style one doesn't have a main breaker).
$400 plus shipping takes them both. $250 per takes them separately.
Specs are
Master
12 20 amp Breakers
12 Edison
6 L14/20 (share circuits with Edison)
Cam pass thru
Grd and Ntrl Reversed
Slave
12 20 amp breakers
3 L14/20
6 Edison duplex
Cam in
Grd and Ntrl Reversed
$400 plus shipping takes them both. $250 per takes them separately.
Specs are
Master
12 20 amp Breakers
12 Edison
6 L14/20 (share circuits with Edison)
Cam pass thru
Grd and Ntrl Reversed
Slave
12 20 amp breakers
3 L14/20
6 Edison duplex
Cam in
Grd and Ntrl Reversed