So you’re still in love with your Viewmaster, but the 4 slides you’ve been ogling over the last 20 years are starting to wear thin on your attention. Image3D provides the service of allowing you to create your own slides to admire.
For $10 a slide, the price isn’t too bad, though the minimum order is 10 slides, so you’ll have to find 9 other people with Viewfinders who have any interest in your crappy family vacation albums. You can even buy Viewfinders from Image3D for only $3, if you feel like force-feeding your relatives some obsolete technology. — Andrew Dobrow