I doubt any serious repair shop could give you a 100% accurate estimate without checking out the unit first-hand (and charging for the service). Why should it trust you (or anyone else for that matter), more so if it isn't a defect covered by your warranty? If you don't like its terms, just walk away and buy another tablet, it's as simple as that.
"Why Genghis Khan was good for the planet: laying waste to land scrubbed 700m tonnes of carbon dioxide from the atmosphere." The Guardian, Jan. 26th 2011