what is the equivalent to modmic but for cheaper

[H34(vop]

what is the equivalent to modmic but for cheaper

 

[Rhys Watkins]

You could look at a lavalier mic which can go for around £20. It's the sort of thing that you clip to your shirt though instead of your headset. Generally mic quality is pretty good.

 

[EsaT]

From various sites on web you could find some 3,5mm plug mics, which could be used this way:
https://imgur.com/gallery/bKU4H

Of course sound quality from used microphone capsule can vary.