I'm looking to buy extreme budget headphones as the title says. The main purpose for these headphones is for use in front of a computer along with an input keyboard. Since these will be bought en masse for a school library (like 10-20 max), the ideal price range for them would be $5 to $25 each. Specs wouldn't matter much but they must be full-size headphones (circum- or semicircumaural; could be supra-, but circumaural preferred), closed, and durable. Preferably they'd have short coiled cables. I know quality isn't much of an option at this price range, but as much as possible would be great. Thanks a lot for your help guys!