Amazon has the Sennheiser HD 206 Closed-Back Wired Over Ear Headphones (Discontinued by Manufacturer) for $20 with free shipping on $25+ or with Prime.
Best Wired Headphone Deals, Earphones on Sale
Monoprice has it for the same price via other third-party storefronts on eBay and at Walmart. (Ironically, it's $500 direct from Monoprice.)
Amazon also has it for $400 with free shipping (backordered).
Amazon with Hecate Direct has the HECATE G2 II Cat Ears THX 7.1 Surround Sound Wired Gaming Headset w/ Mic (Platinum Crystal Pink) for $50 - 10% off coupon (check "Apply coupon" box) - $10 off with coupon code 20DRQZNZ [Exp 10/24] = $35 with free shipping.
Discount reflected at final checkout... Staples has the Logitech G PRO X Wired Over-the-Ear Gaming Headset with Blue Voice, DTS Headphone 7.1 and 50 mm PRO-G Drivers, 2nd Generation 2019 model (981-000817) for $100 - $20 off with code 92864 [Exp 10/15] = $80 with free shipping.
Amazon with WKWZY Direct has the WKWZY USB C DAC USB Type-C to 3.5mm Headphone Adapter for iPad Pro and USB-C Android Devices (Black) for $14.94 - 30% off with code 30USBCDAC [Exp 10/15] = $10.46 with free shipping on $25+ or with Prime.
An upgraded version of the PC37X with new drivers, the same found in Sennheiser's GSP 500 and 600 headsets. Includes one 3.5-millimeter TRRS cable for mobile devices and consoles (no adapter required), and a split cable for PCs.
Ends 9/26 at 10PM PT. Best Buy has the Aluratek Wired 3.5mm Stereo Headset with Boom Mic (Black, AWH352FB) on sale for $6.99 with free store/curbside pickup or $5.49 shipping.
Amazon with Continental Supply has the TCL Elit100 in-Ear Earbuds Hi-Res Wired Noise Isolating Headphones with Built-in Mic (Cement Gray, ELIT100WT) for $6.80 with free shipping. Good Amazon reviews.
On Amazon, the headphones ($69) and microphone ($129) would be around $200 together.
Newegg has the Sennheiser HD 400S Closed Back Around Ear Wired Headphones with One-Button Smart Remote on Detachable Cable for $70 - $30 off with code SENNH98 [Exp 9/12] = $40 with free shipping.
Adorama has the HiFiMan HE6 SE Full-Size Over Ear V2 Planar Magnetic Audiophile Adjustable V2 Headphones (HE6SEV2) for $599 with free shipping.
Adorama has the Adorama-exclusive HiFiMan HE-560 V4 Premium Planar Magnetic Headphones for $239 with free shipping. The HE-560 series headphones have been well reviewed over the years.
Add quantity of 5 to cart to reach $24.95 - $15.95 off with code 5WIRED [Exp 8/31] = $9 with free shipping.