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Asahi Pentax Auto Bellows-A and Slide Copier-A Made in Japan with manual | eBay
$31.00 at the time of posting.
For those of you with K-1/ii looking to scan slides and negatives this is a good choice especially if you can get it for a good price. I haven't tracked these but the were going for around $150 when I got mine for slightly under $100.
It can be used with crop sensor bodies but it takes some work in order to cover the full frame.