I would think that you would want it in an easily accessible place but not too easy. You want them to be able to find it if the need it but you wouldn't want it so hard to find that they might charge back instead.
A link to a support page would be better than "click here to cancel"
Here is an example of one I like... the link is on the bottom of every page along with the copyright info and model age verification.
http://www.lightspeedsupport.com/index.php?r=shap
I don't see a two cents icon so $$ and congrats TGF on the site.