I don't know if better but from feedback here. http://placeshiftingenthusiasts.com/forum/slingbox-hardware/slingbox-power-supplies/#p6624
That under $5.00 power supply from Amazon is pretty popular and seems to work fine.
Thank you for posting here on our answer forum and would like to be of some help today. I would suggest getting a power supply from our online store. The power supplies are built for those units and would work the best for those units. You can buy those units at the link below.
Hope this helps
Sling Moderation Team