Really hard to get GL19. This one has 45mm f/1.9 lens and as you said fairly rare. I have not see one sold in B&S recently. I guess since these were not pretty popular model and the market for fixed lens rangefinder is not very hot, you might land one for something in US$100 range. I have a canonet GL17 (with 40mm f/1.7 lens) and I paid 120 for camera and canonet flash.
How much did you pay for the camera?