Often when sending an Amazon link to someone it will get trashed in the email client.
Here is the normal link:
Howard at work gave me a tip to shorten the link.
Start with http://www.amazon.com/gp/product/
Find the ASIN number for the product. It is normally on the product page, then add that to the url.
The small link to the same product is: http://www.amazon.com/gp/product/B00081RYNC
This is much less likely to get munged in email and is just nicer looking.