I've got 40 of them.
All are in used but good condition.
And they're cheap.
$1 each plus shipping.
A 3 1/4 x 4 1/4 film pack that has some film in it.
It's a little rough -- some external corrosion.
I've not opened it to check the inside.
$2 + shipping.
10+ extra dark slides.
All for $5 + shipping.