There's one on some ebay store for $199 buy it now. So definitely not more than that I would say.
On a side note, I still have my Apple ][+ and a few years ago got the bug to preserve all my old floppies by converting to disk images. I bought a super serial card and a new drive for cheap and transferred most of them to the PC. I couldn't believe how many of them transferred with no issues after sitting in a scorching hot Houston attic for 20+ years!