Will Apple Genius Bar be able to repair my Late 2011 Macbook Pro

My Macbook Pro is being incredibly slow. Every process, including expanding folder view takes a minute. I was chatting to Apple Support via chat for 3 hours, including trying to update the software, safe mode etc, but none of these methods worked, so the person who was helping concluded that its a Hardware issue.

Just wanted to check if I book it in at a Genius Bar, will they be able to send it off for repair, or have they stopped supporting older Macs (Late 2011)? I understand it is out of warranty so expect there will be a cost. Does anyone have any idea of if there are set costs, or is it dependent on need, and if so, are the prices reasonable compared to that of an independent/authorised Apple retailer?

Thanks