I've used a pair of Sennheiser CX 300S for over 2 years now for games and for when I go out I highly recommend them.

Go with sennheiser, those guys don't hold back on sound quality in any range.

i use a pair of sennheiser cx100, only about 30 euro, very comfortable and good sound quality for the price.

chifi has made incredible strides in the past 3-4 years in the budget iem realm (and even >$500+ range), and will blow out any western iem manufacturers in value and sound per $

Blon bl-03 and Tin t2 are the most recommended <$100 chifi iems out there and I can personally attest to how good both of them are

i've ordered the sennheiser in ears and they'll arrive tomorrow, lets see if theyre good

i use shure srh440 and i bought the same headphones again because they're so great
the only minus is the cable, it's long ass 3m corded cable but you can find custom ones on amazon (i found it on polish Allegro)