My first Polaroid camera (since childhood) is the above Polaroid Spirit 600 which I found at a church yard sale for only $1.
My second camera is a Polaroid Land Camera which was purchased at an estate sale.
I also own this Olympus Quickmatic EEM point and shoot camera that dates back to 1967 and uses 126 film. My son found it while at a thrift store and we paid just $5. Technically it’s not an instant camera, but I love the simplicity of the point and shoot models.