Best third-party ink for HP OfficeJet Pro?

Hello there,

I was wondering if anyone could point me toward some reliable shops where I might pick up some compatible ink for my HP OfficeJet Pro?
I used to be able to find much more affordable ink options over at Walmart, but lately, they've switched to carrying this Xerox brand stuff—it comes in that distinctive yellow and black packaging, specifically the Brother Printer model—and the prices have absolutely skyrocketed, nearly doubling what I used to pay.
So, I’m curious to know, what other third-party ink alternatives are actually out there for a printer like mine?

Just bringing this back to the top of the feed so it doesn't get lost in the shuffle.