Any brake rotor will fit. Baer, Rotora, Brembo, Power Stop, etc...
The only ones that wouldn't probably fit with 16" wheels are the big brake kits like TRD
/Stoptech etc... or like AEM
's big rotor brake kit.
You can find hardly used stock rotors around, if you look, for real cheap or next to nothing.
I, like many other Celica owners; have them sitting around collecting dust.