I guess I missed that question about a search and replace plugin. What you want is the free WP plugin called Search and Replace. I've used it and it's a great timesaver. It really comes in handy if you move a site to a different domain and need to change all the internal links, but it will do any kind of replacements.
When it comes to promoting products you have to ask yourself if you would want to have this product promoted to you and if it was would you purchase it.
Then there is the fact that if it isn't great you will get refund requests.
Do this too many times and you will find people ignoring your promotions.
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