It's not unheard of for resellers to perform geolocation, and sometimes in combination with cookies (flash offers persistent cookies that the user needs geeky knowledge to delete), to show different pricing to different users.
It can come down to the browser version and Operating System of the user, an of course not to mention the user's location.
You can play with it if you want, using a browser with advanced features enabled, so that you can change the User Agent String (for example) and retry the search.
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* The User Agent String is a brief text string (sentence) that identifies the browser and operating system of the computer making a query. It's sent every time you open or refresh a webpage, to help the server show you a page with certain features tailored to what your machine can and cannot display or use.
The screen resolution your machine is set to is also sent in this fashion. There is enough information involved that it's possible to identify individual computers, should your settings or hardware be unique enough, which basically means anything set differently than the default new-in-box install.
