EFGHONG via Amazon [amazon.com] has for Prime Members: Dowilldo 20000mAh Cordless Rechargeable Portable Camping Fan w/ LED Lantern on sale for $29.99 - 40% off when you visit the promo code page to activate [amazon.com] (or apply code GQYIB6NZ at checkout) = $17.99. Shipping is free.

Note: Amazon promo codes don't always apply seamlessly. If you run into this issue, refresh the page, re-enter the code, or revisit the cart page.