I should perhaps have mentioned that the type of scanner I was referring to was the 35mm slide or negative scanner not the flatbed type that have an attachment for slides or negatives. ( I have no experience with those) You may find second hand ones that have fulfilled the requirements of the previous owner at a reasonable price but a caveat, I have read on some forums that some of the older models may not have XP drivers available. I believe there are some older Nikons that are not supported for XP. (I'm assuming you are on a PC.)
The more capable ones can be quite pricey and I would not consider anything without a dust removal capability.