Sennheiser cx 300-IIs are still a great buy. Mine are a few years old (the originals) and still sound great, for the money. You can get them for around $30.
I have a pair of Shure and the Sennheiser MM200 Bluetooth, both seal the ear canal to reduce ambient noise and improve bass response. Recommend either, but I use the BT mostly for the wireless convenience and phone function.
Some headphone enthusiasts I asked previously about ear buds and their current favorites gave the Monster Turbines a thumbs up. They can be found for about $50. Personally I think Monster took an earbud and on the other side put one of their RCA ends on it and gave it a fancy name but they really gave the Turbines the thumbs up.
Another set of earbuds that were recommended were the Shure E3Cs. Very good-sounding (a bit warm) and the price was very easy on the wallet at around $65. Also the Shure 420 but you would have to look for bit to find them around $100.
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