If you purchased an iPod before June 24, 2004 then you are eligible for a $45 refund.
Basically there was a class action suit against Apple about the battery life, which resulted in this refund.
Here's the article for those interested:
http://www.cbc.ca/technology/story/2008/05/09/tech-ipod.html
And this is the Apple Settlement page for the claim:
http://www.apple.com/ca/ipod/settlement/