Another thing you can give out (which is a bit cheaper) is just the microphone: http://www.amazon.com/Zalman-Zm-Mic1-Sensitivity-Headphone-Microphone/dp/B00029MTMQ/ref=sr_1_1?ie=UTF8&qid=1432664272&sr=8-1&keywords=Zalman+mic.

Surprisingly it has great mic quality, though you will need to keep it fairly close to your face. I assume most people have speakers, lol.

I love my 668B's they don't have a mic so that might be important to you. You could get one of these and it clips onto the cable

This mic is great

Buy a pair of decend headphones with a clip microphone these and these are better than any other kit I've had (Corsair , Sennheiser, Razer etc.). And everything is replacable in this kit, earpad, headphone cable, and the mic. Which makes it's life expectancy pretty much endless.

https://smile.amazon.com/Koss-KSC75-Portable-Stereophone-Headphones/dp/B0006B486K/ref=sr_1_1?dchild=1&keywords=ksc75&qid=1598144229&s=electronics&sr=1-1

&

https://smile.amazon.com/gp/product/B00029MTMQ/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

If you already have headphones, this would be a decent choice:

http://www.amazon.com/Zalman-Zm-Mic1-Sensitivity-Headphone-Microphone/dp/B00029MTMQ/ref=sr_1_1?s=electronics&ie=UTF8&qid=1385438075&sr=1-1&keywords=zalman+zm-mic1

I have had no trouble with this.

I just use it for Skype calls with a friend or two though. All three of us have one and with a nice set of speaker the quality sounds like they are in the room.

You should check out Modmic

Zalman is also an option. Bought a Modmic myself several months ago, had a set of decent headphones sitting around that I never used, attached the modmic to them, been using the combo ever since. Being able to detach the modmic from the headphones is very nice.