I'd assume you've looked at whether "draft mode" printing is suitable for your use. Most inkjets, and quite a few lasers, offer this option. The print is a little less "crisp" but usually usable, and it can use a lot less ink or toner.

If you're using a color inkjet, you probably realize that some color ink is usually used in default mode even when all you're printing is b/w text, supposedly to "brighten the black." Many color inkjets will revert to "making black" from the color inks if the black ink runs low, but eat the color ink very quickly if you let them do it. In this mode, it takes nearly the same amount of each color ink to make a dot as would be used with black only.

Some color printers allow you to print with the color ink cartridge(s) removed for b/w only, which at least avoids blowing a lot of the (usually) more expensive color fills. The black cartridges are frequently larger, and cheaper on a "per ml" basis than the color inks. You may have to dig pretty deep into your printer specs to find out if this is a "legal" option with your printer. (With some printers, the ink in unused channels dries out and clogs the printer if you operate without a cartridge in place - even if the printer will let you do it.)

Depending on your job requirements, the cheaper laser printing costs may make it feasible to take a disk to a local printshop and let them laser print from your disk files, if one of them offers that service in your area. It's a very close trade-off though, in my area, so you need very accurate estimates of your per-page costs on your own printer to be able to judge whether it can save money.

If sufficient multiple copies are needed (over 1,000 pages perhaps) the best of my local printshops can duplicate a single set of b/w master pages quite a bit cheaper than I can self-print on laser, and easily beat inkjet costs (for b/w copies) even for smaller runs. (Note that 10 copies of a 100 page document should be the same cost as 100 copies of a 10 page document. Either is 1,000 "pages" printed, the usual way of "costing" print shop duplicating.)

Not really what you asked for, but I'm all in favor of saving money any way you can.

John