Link:
Price:
10
Retailer:
Amazon.ca

 

Patio Umbrella Light, 32 LED Rechargeable , 2 brightness modes = $10 with coupon code AMD6RJFG

From the description:
Uses a bit of an unusual usb cable, does not include a charging plug
The patio umbrella light can be charged for 8 hours and can last 10-72 hours.
Two brightness modes – no remote
Clamp can fit .78-2.04″ (2-5.2cm) diameter poles (does not seem to have a hanging option)
White light only

 

Link: