Desktops with physical PCI slots, I've got:

Performa 6300CD

Power Macintosh 5400/200

Power Macintosh 4400/200

Power Macintosh 6400/200

Power Macintosh 6500/275

Power Macintosh 7200/120 PC Compatible (120MHz 604 w/133MHz Pentium)

Power Macintosh 7300/180 PC Compatible (180MHz 604e w/166MHz Pentium)

Power Macintosh 7500/100

Power Macintosh 8500/150

Power Macintosh 8600/200

Power Macintosh 9500/132

Power Macintosh 9500/180MP

Power Macintosh 9600/300 x2

Power Macintosh G3 DT (266MHz 750)

Power Macintosh G3 DT (300MHz 750)

Power Macintosh G3 MT (333MHz 750)

Power Macintosh G3 MT (416MHz 750, 83MHz bus)

Power Macintosh G3 AIO

Power Macintosh G3 B&W (450MHz 750)

Power Macintosh G3 B&W (350MHz 750)

Power Macintosh G4 AGP (450MHz 7400)

Power Macintosh G4 Gigabit Ethernet (400MHz 7400)

Power Macintosh G4 Digital Audio (533MHz 7410)

Motorola StarMax 4000/200

Motorola StarMax 3000/180MT

Motorola StarMax 3000/180DT

PowerComputing PowerBase 180 (180MHz 603e)

PowerComputing PowerCenter 132 (132MHz 604)

PowerComputing PowerTower Pro 210 (210MHz 604e)