Well, I'm not familiar with metal frame transparencies, but I've made digital images of transparencies with a regular scanner by simply placing a white sheet behind it. If scanning isn't an option (no scanner, metal frames interfere), you probably should try calling some photolabs or companies that deal with digital imaging. Someone might have equipment that will allow it to be done relatively cheap. If you think you might want to buy a scanner, you can probably expect to spend about $100 for a decent one. Look into Umax scanners, last time I shopped around (it's been a while) they made a good scanners at a decent price. You may also be able to produce your digital images with a digital camera. It's a bit awkward, but it's what I used to get images of my brother's paintings. However, it took a decent amount of post work to get them to look right. I had to take each image into photoshop, draw a marquee around each image and use distort to get rid of the skew. Anyway, good luck on that.