If you are an American or Canadian, this weekend marks the deepest sales and discounts of the year for electronics. Whether you shop online or in physical stores, whether you favor "Black Friday" or "Black Monday," I urge you to add one more item to your shopping list.
Please buy a USB headset. They are cheap, easy to find, and almost any of them will work just fine for webinar work. I don't care whether you buy one branded as Logitech, Microsoft, Plantronics, or Sennheiser. It is a million times better than the built-in microphone on your laptop. It's a thousand times better than the earbuds with integrated cord microphone you use on your iPhone. It's more practical than the separate desk microphone you plug in to your desktop computer. And it works with all the major web conferencing / webcasting products you use.
Good quality, name brand units cost $20 - $50 at normal retail prices. You should be able to do significantly better than that this weekend. Do it. Your audience will thank you.