Considering that i can't use bittrex as they require verification, what is the best exchange where i can buy gbyte?
You can use cryptox.pl. It's been a long time since I used it but it was pretty dependable back in the days, it probably still is (no complains as far as I know). The only
issue is that the volume is relatively low.
Cryptox has worked well for me as well. Quick and reliable.