The Epson WF-2830’s cost-per-print is acceptable. Although the cartridges don’t last very long, they’re not very expensive. This helps keep the cost-per-print fairly reasonable, but keep in mind that the more you print, the more you’ll end up spending in total.
Also, even if you print only in black, most inkjet printers continue using their color cartridges for servicing tasks, so they’ll likely need replacing at some point as well.