Originally Posted by Marc B.
The smaller 3.25" X 4.25," PA-145 (Fuji), or 405 (Polaroid), used backs
are usually at/under $50-$60 USD, in either medium or large format mounts.
I got the 405 pola... someone can have one for $29 sent anywhere in the USA. I think I have at least two I will part with.
Mine are the slide-in where a 4x5 holder would go type.