These are a bit more rare now that inkjets have improved. Beware that cost of operation.

Here's the wikipedia -> http://en.wikipedia.org/wiki/Dye-sublimation_printer

And yes, it was as I suspected. Inkjets did surpass dye sub in color capability. However some dye subs can give you water proof prints.

I thought the prints were a bit fuzzy and the article notes that.

You'll also notice at http://reviews.cnet.com/computer-printers/?filter=500172_103957_ that most of those dates are years ago. That's right, it's a technology that consumers no long seek out.
Bob