I've got a fair few of them. If we go by legalities and non-legalities:
Mac OS ROM Update 1.0 (Pre-Extracted, Works with SheepShaver) - 2 MB
Power Macintosh 6100-60 AV - 4 MB
Power Macintosh 7100-66 - 4 MB
Power Macintosh 7300 - 4 MB
Power Macintosh 7600 - 4 MB
Power Macintosh 8500 - 3 MB
Power Macintosh 9500 - 4 MB
Power Macintosh 9600 - 4 MB
Macintosh Performa 6300 - 4 MB
The only exception to the 4 MB is the 8500 ROM at 3 MB total. All of these are extracted from machines that I have had or either no longer have but have kept for archival purposes.
Also have an extensive collection of Apple ROMsets (Apple 1, Apple 2, Apple 3, Lisa) along with stacks of 68k ones.
If we were all angelic law abiding citizens, these roms would have died into computing history, nobody would run Mac OS 9 again via emulation because it would be "the wrong thing to do". Unfortunately we need to step on a few feet to preserve these, and so it shall be.