35mm slide scanner
If you want to do it yourself, you will need a good scanner and lots of time.
You can estimate that you will spend about 3 minutes per slide once you get set up.
With 3,000 slides you can count on spending approximately 150 hours.
Your best solution is to use one of the many scanner services.
You can find many that will do the job for about 29 to 39 cents each.