I don't know any site that could do that, but you always can try to find what you need on amazon and then buy it via purse.io, i am sure that it will send to you
This is probably the only solid option. I know newegg accept bitcoin but shipping may be a problem. And when it comes to pc parts you need something new with guarantee.
Else you could use this forum to find your pc parts second hand with a second hand price.