Yeah they are expensive, but from all accounts I've seen the price (used) is worth it.
Check out the 135mm Wide Field Ektar. Its much less expensive. However you have to be careful with older, used lenses as their shutters may not achieve the 1/250 you are aiming for.
If you limit your lens range from 90 to about 150, I suppose you could get a speed graphic and attach the 6x17 back to the Graflok, which would let you shoot up to 1/1000 with the focal plane shutter. Longer focal lengths with this setup will crop the 6x17 image (I'm not sure at what focal length the cropping begins).
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