I've never had a problem finding replacement parts for phones, tablets and other devices including batteries, screens, power buttons, headphones jacks, etc. All

I've never had a problem finding replacement parts for phones, tablets and other devices including batteries, screens, power buttons, headphones jacks, etc. All are readily available if you're willing to wait a few weeks for shipping. Maybe a few things aren't "genuine", like finding OEM batteries is pretty tricky with some devices, but the ones you get do the job with no significant issues in my experience - just beware of the risks of faked specs and buy the cheapest rather than paying more for faked spec. The thing about repair is it's often not economically viable, especially if you're paying for labor - for example, I could have payed someone $100 to replace the phone screen on my Nexus 5 - a brand new one on ebay goes for $170. I may as well just buy a new phone or use it as an excuse to upgrade. So in many ways, the repair shops are a bigger impedance to repairs than the parts situation in my opinion. Instead I was able to buy a replacement screen assembly directly out of China for $30 and do the replacement myself for free, it's the only way the repair made economic sense.