What printer(s) are you using? Can you recommend a certain printer model for printing maps? I noticed that Epson makes a 24" capable printer for about $800. Of course, there are higher/more expensive ones as well. I have an Epson "professional" photo printer at home, but it is limited to 17" max.
I use a 24" HP that is no longer in production. Printers are a odd purchase for most owners. They are very, and I mean very, expensive option. Generally, you need to purchase the type that takes more than the standard CMYK inks. Mine, for instance, takes 8. CMYK and a few "photo" colors as well. And if you thought that regular ink was expensive....oh boy! These are also not the type that respond well to generic ink or refills.
Internal print settings is something that you would have to look into. Not all printers will print on all paper types.
Also, you would need to make sure it comes with the stand. And in addition to that, you have to figure on actual size. Even though it has a printing area of 24 inches, the actual printer is much larger than that.
Paper is also another big deal. A roll of Tyvek is a few hundred bucks.
I had a 44 inch, 300 pound, Canon in the past and sold it because it was a ink hog. It would do a self cleaning cycle every X amount of prints and would just blast though all my inks. That unit took 12 and the ink tanks were 700 ml (think whisky bottle here). But it made the most awesome prints. Art gallery worthy. When this HP is a little bit older, I'm going to go with Canon again, just a little bit lesser of a model since that one was a too much for what I need.
So now that I have done a through job of dissuading your from buying one, you should just purchase maps from me!