+1 for Arcade Gear/Jap-Sai. I bought lots of Japanese PS1 and PCE games from them last year. Quality of the games have been outstanding, and the prices were really affordable. They put a good effort in packaging if you choose EMS and their customer support is really friendly, I had good communications with them.
Since January 2014, their store seems to be undergoing a major update, so you can't see actual prices. Let's hope they'll be back to regular service soon.