good source for non-captive linear steppers? (no replies)

Hello I am looking for a good source for affordable non captive linear stepper motors, something in the nema17 range. I need at about 150mm usable stroke for driving the plunger down in a syringe, finest pitch so the most possible power is generated.

Preferably in the US, as I am based there for some more months but anywhere else is helpful too!

Thanks!