Another DIY option is to use a Nikon Coolpix E4500 with Nikon ES-E28 Slide Copy Adaptor. This combination will make reasonable quality 4Mp JPG copies at the rate of one slide every 8-10secs, or a bit faster if you have someone to help with a blower brush and pass the cleaned slides to you. It will also take TIFFs but that takes much longer due to the slow write speed - slower than using a V700 with slide holder.
The E4500 has a high quality macro lens and the slide copy adaptor is specifically made for it. You might be able to pick one up on the popular auction site. I've got both, and used the combination to make quick copies of a family's slide archives. Results were quite acceptable for small prints or web.