Does anybody know where to get such perl for windows?

I don't know of any pre-compiled debug versions of perl for windows, but it's quite easy to build one from source. Both the Win32/Makefile (for use with Visual Studio) and Win32/makefile.mk (for use with MinGW) in the perl source accommodate the building of a debug perl. (See the comments in the configurable section of the relevant makefile - it should just be a matter of uncommenting in one line.)

Cheers,
Rob