having no desk printers is a good start. Inkjets are insanly expensive. The laser printers depending on the machines can be pretty easy to help cut cost. You can buy a Laser color now for $1500 and it's network ready. Sure the upfront is high, but it's the long run that matters. I'd suggest the following:
If a personal is needed, only allow black and white, MiniLaser printer.
Get 1 or 2 Color Laser printers and set them up so they allow good traffic flow.
Then you only have to support those printers and the costs will go down pretty quick.
for yearly maintence for a color laser doing 20K sheets/year, you looking at about $600-1200 per year average. Price can vary based on a few factors. For a B/W laser, your about $300-600 depending on some factors.
There are a lot of factors to take in, but in the end, Laser is the only way to go. Ink printing should only be in the home, and that will only last as long as laser is too expensive up front.