B9Scrambler
Headphoneus Supremus
brokentofu
I am waiting for QKZ W1 PRO for my running, the are recommended here, I have no idea if they the best up to 3usd but they ridiculously cheap - 8usd so no worry when they get damaged. In addition, in their description, they are advertised as waterproof.
Woo! W1 Pro is a great cheapo iem