Depending on the number of slides you need to do, it might be cheaper to ask a local shop, who develop photo's to do it for you.
I had about 1000 and built my own system to do so.
If you are interested, I can copy them and put them on a CD /DVD for you.They will have to be edited(Picassa from google - free), as I take the slide and a part of the cardboard/ plastic as part of the picure.
If you are interested, email me at [email protected], putting 'Slides' in the subject box, and we can make some arangement. Terry