Ebay offers Refurbished Anker Nano 30W 10000mAh Portable Power Bank for $24.99 (reg $49.99) with free shipping.

Product Features:

• 30W High-Speed Charging：Get fast 30W charging and recharging using the 30W USB-C cable. Recharge the power bank to 50% in just 45 minutes or charge an iPhone 14 to 50% within 30 minutes.
• Small Size, Mighty Performance：Carry massive power in a conveniently compact form with this power bank, measuring only 4.09 × 2.06 × 1.02 inches.
• Easy Portability, Endless Power：Enjoy effortless portability and uninterrupted power thanks to the reliable USB-C cable, complemented by a built-in handle for easy carrying.
• Stay Informed with a Colorful Display：Keep track of your charging status with ease using the vibrant color screen, providing you with detailed information in a user-friendly interface.

Specs：

• Weight: 7.58 oz (215 g) 
• Dimensions: 4.09 × 2.06 × 1.02 in (104 × 52.3 × 26 mm)

Input: 

• USB-C Cable: 30W Max (5V⎓3A / 9V⎓3A / 15V⎓2A / 20V⎓1.5A） USB-C: 30W Max (5V⎓3A / 9V⎓3A / 15V⎓2A / 20V⎓1.5A）

Output:

• USB-C Cable: 30W Max (5V⎓3A / 9V⎓3A / 10V⎓2.25A / 12V⎓2.5A / 15V⎓2A / 20V⎓1.5A）USB-C: 30W Max (5V⎓3A / 9V⎓3A / 10V⎓2.25A / 12V⎓2.5A / 15V⎓2A / 20V⎓1.5A）USB-A: 22.5W Max (5V⎓3A / 9V⎓2A / 10V⎓2.25A / 12V⎓1.5A） Total Wattage: 24W Max

What You Get: Anker Nano power bank (30 W, integrated USB-C cable), instruction manual