Need help/suggestions what to do with faulty Ipad (Touchscreen)

Been having a lot of problems with my Ipad 3, after about 5 mins (sometimes less) of using it, all of a sudden the touch screen will completely stop working and won't respond OR it will start behaving weirdly and start opening and closing different apps on it's own and also type letters etc without me touching anything
I went to an apple store and because it is out of warranty by a few months they said it will be £209 for a replacement! :(
Can't afford that atm, so wondering if anyone has any ideas on what I can do? Would I be able to get it fixed anywhere for much less than getting a replacement? Not sure if just a screen/Digitizer replacement would work
Any info is appreciated, as it sucks not being able to use my Ipad at the moment!