YMMV on price, based on location. Best Buy has a 2-pack of the Insignia 10W Qi Certified Wireless Charging Pad for Android/iPhone (Black, NS-MWPC10KTP) on clearance for $8.49 with free store/curbside pickup, free shipping on $35+ or $5.49 shipping.
Best Mobile Charger Deals, Wireless Chargers on Sale
Amazon with AnkerDirect has the Anker PowerWave Sense 2-in-1 Wireless Charging Station with Watch Charging Holder—Watch Charging Cable & AC Adapter Not Included (Black) for $20 - 20% off coupon (clip coupon) - $2 off with coupon code ANKERB95 at checkout = $14 with free shipping on $25+ or with Prime.
Includes 2 USB ports for wired charging, a pen/pencil organizer, and the 5W wireless charging pad.
Ends 8/31 at 10PM PT. Electronics.woot! has the Aduro PowerUp Trinity Pro 3-in-1 Wireless Charging Power Station Qi Fast Charging Dock for Apple iPhone, iWatch & AirPods (Black or White) for $28 with free shipping with Amazon Prime or $6 shipping.
Walmart with DLR Hunter has the mophie Powerstation Go Wireless Portable Car Jump Starter with AC Outlet and Wireless Charging (Onyx) on sale for $75 with free shipping. Includes 2 USB-A ports for charging devices.
Best Buy has the Best Buy Essentials 65W USB-C Wall Charger (BE-PWLS2) on sale for $15 with free in-store pickup, free shipping on $35+, or $5.49 shipping to home. (USB-C cable not included)
Amazon with JOYROOM Direct has the JOYROOM 4.8A Dual USB Cigarette Lighter Car Charger w/ LED Light for $11.99 - $6 off with coupon code AOXJMPMG [Exp 8/20] = $5.99 with free shipping on $25+ or with Prime.
Ends 8/31 at 10PM PT. Electronics.woot! has the Aduro PowerUP 40W 6-Port USB Rapid Charger (10 color options, PW-HUB6P) on sale for $15 with free shipping for Prime members, or $6 shipping.
Amazon with BDCollection US_ ESR has the ESR HaloLock Magnetic Wireless Air Vent Mount & Car Charger for $35 - $9 off with coupon code 2BB7TMQA [Exp 9/4] = $26 with free shipping.
Best Buy has the Insignia 20W Qi Certified Dual Wireless Charging Pad for Android/iPhone (Black, NS-MWPC10K2) on clearance for $16 with free store/curbside pickup, free shipping on $35+ or $5.49 shipping.
Amazon with Syncwire Products has the Syncwire 2-in-1 Magnetic MagSafe Compatible Wireless USB-C Charging Stand for $40 - $16 off with coupon code M43ODIHQ [Exp 8/14] = $24 with free shipping on $25+ or with Prime.
Amazon has the well-reviewed Panasonic "Advanced" eneloop Individual Battery 3 Hour Quick Charger with 4 LED Charge Indicator Lights (White, BQ-CC55SBA) for $17 with free shipping on $25+ or with Prime.
Charges 4AA or 4AAA eneloop cells in up to 3 hours; 2AA or 2AAA in up to 1.5 hours eneloop pro 4AA or 4AAA in up to 4 hours; 2AA or 2AAA in up to 2 hours.
Ends 8/12 at 10PM PT. Sellout.woot! has the Apple 5W Charger & 1-Meter Lighting to USB Cable on sale for $19 with free shipping for Prime members or $6 shipping. Also available: 2 Chargers & 2 Cables for $28. (MSRP: $76)
Amazon with NewCentral has the AINOPE 48W Super Mini PD & QC 3.0 Dual Port All Metal USB C Car Charger for $16.99 - 15% off coupon (check "Apply coupon" box) - $5.78 off with coupon code 9UFIY5QF [Exp 8/7] = $8.66 with free shipping on $25+ or with Prime.
The pictured Aduro Surge Wall Tower Charging Station with 12 Outlets & Dual USB Ports (White or Black) is on sale for $19 (68% off).