HP plotters

A little while back a friend of mine (little bit of a collector, he has a Basis 108 and a DEC Pro 350, and some VAXen that he used to use) was starting to get into slide photography and going through his father's collection of slides (mostly having to do with the NYC subway system and like things in other cities). He decided he wanted to print on photo slide mounts; handwriting them doesn't work for him because he has crappy handwriting. So we spent some time at Fry's looking at inkjet printers, and decided the paper paths were too contorted -- no way to get a slide mount through there, let alone the sort of cardboard carrier we thought we'd need. We thought about it a while and decided that a plotter would be the way to go. Of course, who makes plotters in this day of cheap color inkjet printers (with expensive ink cartridges)? So I went to the next Computer Recycling Center sale and picked up a somewhat grungy 7550A for $10 and passed it along to him. He bought some pens on eBay, worked out some HP-GL, hacked up a pen and an extra-fine Sharpie, and put together some bits of cardboard to make a carrier for a few slide mounts, and he was all set. So I guess they still have their uses. His only complaint is that the 7550 takes up too much table space. I guess I'm keeping my eyes open for an 7470 or 7475 with RS-232 interface.