If you treat a cheap cable gently, and with respect, it should last as long as an expensive one. Abuse it and you can wreak a high prices one.
Try http://www.dabs.com/search?q=HDMI%20cables - they start at around £3.27
I've been using Dabs.com for many years without any problems.
To give you some context to this poll, read this CNET blog:
HDMI cable buying guide
Do you pay a premium for HDMI cables?
-- Yes, I believe that quality comes with a price. (Tell us why in this case?)
-- Sometimes. (When do you?)
-- No, they are all the same. (Why is that?)
-- Other. (Please explain.)