Commercial slide scanning is also an option, but do the arithmetic on whether it is cheaper to buy equipment (e.g. thousands of slides) or pay for scanning (e.g. hundreds of slides; consider www.videoconversionexperts.com). Also, factor in your own time commitment. With slide preparation (ca. 0.25-0.50 min./slide), scanning itself (ca. 1 min./slide for high resolution), and final review and editing (ca. 0.50-0.75 min./slide), your time could be a 1-3 min./slide. Batch scanners are essential for thousands of slides. I had to buy a Nikon Coolscan 5000 ED with an SF-210 batch feeder (ca.$2000 on eBay today) and retire to scan 20,000 slides over 5 years. If you really get into scanning, read "Scanning Negatives and Slides: Digitizing Your Photographic Archives" by Sascha Steinhoff.