VGA monitors should be a dime a dozen.
i would imagine you could find another pretty easy?
Toaster requires a 15KHz-capable monitor.
@ commpsy
I'm guessing you had something like a Commodore 1942, 1960, or Electrohome 1440? Those are tough to replace. I suggest forgetting the VGA angle and just finding a regular Commodore 1084. They can still be found relatively easily for not too much money.
There are some modern LCD screens that work with regular 15KHz Amiga signals, but I don't know if they'll work with the complexities of Toaster video.