Hi there,
Boyzo's recommendation is the best solution but as he points out it is expensive. I have read that some people will buy something similar on eBay and then re-sell it when done with their scanning of negatives.
I bought this last year for $80
STAPLES | BUREAU EN GROS . It is fast and produces average results which can be fixed in post processing but with limitations
When the photo has a large clear subject then the result can be quite good after some simple LR3 adjustments - contrast, white balance, and noise reduction. However, The software in this scanner oversharpens so when the subjects are medium to small, it can be difficult to correct in post-processing.
As an alternate suggestion, flatbed scanning of 4x6 photos can turn out quite well. You get high resolution, much better colors and contrast. The tradeoff is its highly manual and very slow if you plan to do a lot of photos. Dust on the scans is also an issue.
If you go to my gallery
Miscellaneous - SeriousCompacts.com Gallery, there's a photo of my wife and me from 20 years ago using the film scanner - about 2 inches of hairline and 15 pounds ago ... getting old sucks
I've also uploaded a flatbed scan of my son and niece titled Julianne the Bully - There is a lot of detail and I was able to sharpen effectively
Hope this helps. If you have any other questions feel free to pm me.