Earbuds are already pretty inexpensive, but there are still situations where you need them cheaper. Airlines, buses, and other transportation services offer disposable earbuds as a convenience as do offices that have waiting areas like the dentist or the doctor's. Buying them in stores at even the lowest price points could still run you over thousands of dollars if you are offering them to lots of people.

The sites that most commonly offer earphones in bulk are auction style sites. So of course you can find them at the most famous site, eBay. When using the site, search the site for "wholesale earbuds". Use this term when searching other sites as well as this is the most common accepted term for them. Alternatively you can try the following link: Wholesale earbuds at eBay

Another good site is DHGate, which has many options for buying in bulk. When using this site make sure to set up a price filter as there are a lot of more expensive earphones offered in bulk that wouldn't be good as a cheap option. Buy earbuds in bulk at DHGate

AliExpress is a site like DHGate, again remember to sort by price as there are a lot of other more expensive earbuds returned in your search. More bulk earphones at ALiExpress

Liquidation.com is another site offering wholesale items. This site lists the conditions of the earbuds, if there are New, Returns, Salvaged, etc. So make note of the condition before you buy. Also, this site doesn't show price/per unit in your search results, so you have to navigate to the details page to get this information. So a little less user friendly than DHGate or AliExpress, but still worth checking out.

This is just a small set of the vendors online that you can buy wholesale earphones from. If there any other sites you like to use, send a mail to contact@noisereducingearbuds.com to add it to the list.