1. Create a directory on the website.
2. Exclude the directory from search engines in robots.txt.
3. In the directory, create an HTML file that meta refreshes to the affiliate link.
4. On the appropriate website page, link to file in the excluded directory. You are essentially redirecting a link.

Naturally, this may run afoul of your affilate source's rules, and it will blow out your metrics because it will look like you have a 100% click through rate. However, the pages on your own site will be linking to interior pages, which just happen to redirect to the affiliate. This may be a search engine gray area, but people still need to physically click on a link to get redirected.

I was wondering how does one cloak a link for example one thats from either commision junction of ebay. Can you advise me how to go about this without getting into trouble with my sites.