I know quite a few guides sell their guides via clickbank.com
Here's a guide to get such guides or any guides from clickbank.com for free.
List of guides can be found at Clickbank Marketplace --> Games --> World Of Warcraft
Once you order you can get a refund by forwarding the details to [email protected]
You have to include the following
Your Clickbank name [insert the sellers ID here]
The receipt number for the purchase [insert the receipt number here]
The approximate date of the purchase [include approximate date of purchase]
The name or email address of the customer [include your email address]
It takes up to 3 days for them to process the refunds as they do it in batches. Haven't had a problem yet.