As others have mentioned, I'd suggest using proper monitors or studio headphones for the bulk of the mixing, and use the earbuds to "check" it to make sure it sounds good there.

For earbuds themselves, see if you can get a pair of the Apple ones included with iPhones, as they're very common, relatively decent, and you might have some friends who hate them but keep them in the closet "just in case" (like me). Yes I know, you'll have to find an older set with a normal 3.5mm headphone jack, not the new Lightning ones...


I work here