New injectors are pretty damn cheap these days.....

Most Jap stuff use high impedance, although wont be typical Bosch style fitment if thats what you are after.

the 440cc/42lb Bosch SVO Greens from the US, at 12 ohms are very cheap.

Looking at your sig....consider maybe the old Volvo 940 turbo's. Not sure if they are high or low impedance.
Porshce 944 turbo or 924..although probably not easy found.

Audi 5cyl turbos, Saab 900/9000 turbos ?