Star City Games is literally perfect. They have a great inventory, great prices, great reputation, great card conditions (when they say 'near mint' it is literally perfect), and you can ensure all your cards will be real. What really does it for me though is the shipping time. Holy sh*t I order something on a Wednesday and it comes in Friday morning, and that's when I select the cheapest shipping option. I live on the opposite side of the country.
I genuinely have no idea how this is even possible.