If the radio has: name="retailprice"
Then you would reference it with $_POST['retailprice'] in the parameter.
The blank line of code might be preventing the redirect... make sure the blank lines are removed.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.