These will be price of shutter only for the most part. If you end up using the glass, it's a "value added extra!"
The Copal 0 has had it's aperture poked completely out of it. Shutter speeds are excellent. Pinhole camera?? Parts??? $65
Compur 0a? Front thread is the standard size 0. 29mm front, 27mm rear. Probably from some fine old folder. Speeds are purrrrrfect. Nice multi-blade old school round aperture. $45
Alphax with Wollensak Series IIIA f12.5 3½" (yes Virginia, that's 'merican for 90mm). Shutter works flawlessly at all of it's speeds. 10 25 50 100 200. Cable release alignment is fussy but that is the design nature of this shutter as well as it's black faced brother. The cable end bypasses the inner mech about half the time and gets stuck. PITA but it's old school cheap American stuff. What can I say! $65.00 Should mention; the glass in this is awful. It'll make nice pictures, but it's cloudy and even has some scratches.
Last and maybe least is the wee Velostigmat. Every caveat explained above applies to this little fellow also. Find a really FAT old Wolly cable release and make it happy. The 83mm velo was stock on the little tin can Ciro Flex cameras like Don Normark used for his book "Chavez Ravine; A Los Angeles Story 1949" $44.00
Mix and match, buy more than one, and ask for a discount! Shipping $6 each unless you buy multiples. No retainers or flanges included.