Reddit mentions of USB Microphone Cable 10Ft, Tanbin 3 Pin USB Male to XLR Female Mic Link Converter Cable Studio Audio Cable Connector Cords Adapter for Microphones or Instruments Recording Karaoke Singing (10ft)

Ok, so you need a mic as well. Alrighty. I'm going to suggest you go a different route than pretty much what everybody else is suggesting. I personally dislike the all in one headsets, especially if they're marketed as "gaming", double especially if they are 5.1 or 7.1 surround sound.

If your priority is actually hearing things in game, and determining direction and such, you are better served with a stereo set that emphasizes the mid range and high end frequencies while de-emphasizing the low end. Low end boosting is an inexpensive way for manufacturers to make a cheap set of cans "sound" expensive, and while it can make movies and some music sound great it's not amazing for gaming.

Here we go with a 100 budget. I'm going to give you a buying list for a standalone set of headphones paired with a separate mic setup:

• Headphones: Superlux 668B - $38. https://www.amazon.com/Superlux-HD668B-Dynamic-Semi-Open-Headphones/dp/B003JOETX8/ref=sr_1_1?keywords=superlux&qid=1568577791&sr=8-1
  
  • Open headphones provide a larger soundstage compared to closed back cans. These particular headphones share the same large drivers as the excellent AudioTechnica AD700's, which means you are getting a frequency response targeting the high end and mid range. The directional ability of these headphones can't be beat for under $50, and will challenge $100 to $150 cans.
    
• Microphone: Pyle-Pro PDMIC58 - $14. https://www.amazon.com/dp/B003GEBGA0/ref=emc_b_5_t
  
  • I would rather suggest the Behringer xm8500, but that mic's availability hasn't been great recently. If you can find it for regular price (around $20), it's worth the extra few dollars. The Pyle-Pro mic is more than adequate for gaming voice chat though. It will be miles better than any headset mic regardless. And it's also a dynamic mic, which means it will refuse sounds from your room or keyboard or mouse.
    
• Microphone boom arm: InnoGear boom scissor arm - $14. https://www.amazon.com/InnoGear-Microphone-Suspension-Adjustable-Snowball/dp/B01L3LL95O/ref=sr_1_7?crid=2ZTQGVRG0AY74&keywords=mic+boom+arm&qid=1568578206&s=musical-instruments&sprefix=mic+boom%2Cmi%2C174&sr=1-7
  
  • It's a desk mic boom. It stays out of your way while holding the mic in your face. What else do I need to say?
    
• USB XLR audio interface: Two options...
  
  • Inexpensive USB to XLR cable: https://www.amazon.com/Microphone-Tanbin-Converter-Microphones-Instruments/dp/B079DQ9ZPT/ref=sr_1_4?keywords=usb+to+xlr&qid=1568578338&s=musical-instruments&sr=1-4
    
    • This will work just fine and keeps you well under your 100 budget. Which leaves you room for a better mic or different boom arm if you rather. Or maybe even a step up to the AudioTechnica AD500x headphones if wish.
      
  • Behringer UM2: https://www.amazon.com/BEHRINGER-Audio-Interface-1-Channel-UM2/dp/B00EK1OTZC/ref=sr_1_21?keywords=usb+to+xlr&qid=1568578338&s=musical-instruments&sr=1-21
    
    • This is not necessary, and puts you just over your 100 budget. You do get a bunch more flexibility with it. For instance... you can plug your headphones straight into it. These interfaces tend to have great stereo separation and low noise floor compared to on board motherboard audio. You also get an extra input and nicer mic pre amp. Again not necessary, but well worth the extra $$$ in my opinion.
      
      There you are sir. A flexible solution that can come quite a bit under your budget. You get way better headphones than the gamer marketed ones and a way better and more flexible mic solution as well. Have fun!

Since that's an XLR mic, so you need an XLR to USB ADC. This one is cheap and fairly well rated. You can go even cheaper, though the quality will likely be quite poor. Then again, your good mic with even a $10 ADC will likely be at least as good (probably better) than the sort of cheap-ass headsets that most people use for such purposes.

Which kind of forces the question of why you want to use a nice mic just to communicate in chatrooms. You can get a cheap-but-decent wired gaming headset for under $20 and save your nice mic for whatever you normally use it for.