Get me some ink, Man

I just got a new printer for business and I finally went through my black ink. I've been looking for a replacement cartridge and oh my gosh, ink is expensive! I really wanted to find cheap ink.

I couldn't believe inkjet cartridges can be so frustrating to find also. My brand of printers ink had been discontinued already! So I need to find a compatible ink for the printer ink now. I'm also used to having just two cartridge, now I have six to change-ouch!!

Another option is to refill the ink cartridge. What do you do when you need an ink cartridge changed?