Seats are 100% a personal preference.
If you like Corbin, be patient.
You can get a steal here on them once in a while.
There are several other good quality seats out there. But, they all are a little different.
No one in particular that you could say is very similiar to Corbin.
I tried 6 seats on my gen2, none were like the Corbin, which was my favorite.
2 stock seats, both factory, one was rock hard after 5k miles. The other was very soft from brand new.
Tobin/New Image
Suzuki gel
Saddleman
A custom
And the Corbin