The Heart Guardian AED from Radian is probably amongst the cheapest AEDs on the UK/Irish  market today. It represents great value and yet is simple to use. The HR-501 is manufactured in South Korea to international standards. South Korea are leaders in electronic equipment and not to be confused with other Asian manufacturing outlets.
There may be cheaper AEDs being sold but check they are not old stock being dumped onto the market.
An easy to use button allows you to choose between energy levels for a Child or Adult.
 
Includes
1 set of Adult/Child Pads
1 service log book
1 battery
1 AED responce Kit 
 
Features:
ECG Analysis: 8.5 secs
Hi-Cap Charging: 8 sec
Shock Output: 150j Adult / 50j Children
Data Transfer Protocol: Bluetooth 2.0
Control Buttons: Shock, Power
Battery: Li-Mn (12volt DC 4.2A)
Pads Type: Disposable Self Adhesive
Dimensions: 230W x 320L x 85H mm
Weight: 2.3kg
Warranty: 5 years / 4 years for the battery
Paid Repair Service: 10 years
The HR-501 Heart Guardian AED from Radian is probably the cheapest new AED on the UK market today. It represents great value and yet is simple to use. The HR-501 is manufactured in South Korea to international standards.
An easy to use button allows you to choose between energy levels for a Child or Adult.
RADIAN Co., Ltd., is a socially active corporation dedicated to saving lives,
it was established in October 2005 and has been specializing in R&D, manufacture and sale of sensors, medical devices, measuring equipment, tester, etc., over the last decade and a half.
In Particular, RADIAN Co., Ltd., has opened up the market for medical and healthcare business in 2014 based on its know-how and expertise amassed in the field of precision measurement/analysis for many years of work, along with its patented technology and technological capability of its professional researchers.