Cd games don't have regions locks or write protection, make of that what you will.
Super Airzonk Rockabilly paradise is good, though not as good as Airzonk so
CD PC Denjin Rockabilly and Pc Denjin are the Japanese names, since I noticed no one suggested airzonk
Gate of Thunder and Lords of Thunder are both good shumps,
Hellfire S is great as is Nekketsu Soccer, and I forgot, their is a card of Nekketsu DodgeBall,
also if you are getting an arcade card you might as well pick up the snk ports of Fatal Fury 2, Special, World Heroes 2, and Art of FIghting.. well maybe not art of fighting
and Ginga Fukei Densetsu Sapphire (Though I wouldn't pay the rather high price it costs) as you better get some sort of use out of it

can try asking around here:

http://www.pcenginefx.com/forums/


http://www.pcengine.co.uk/

prices vary to be honest.. I've ordered stuff from this place too but paying them is a little tricky.. you can set up an account and do a test run!

http://www.japangamestock.com/videogames,jeuxvideos,import,67.html

also I've used these guys once or twice for stuff.. just remember about import tax tho..

http://www.play-asia.com/paOS-14-71-c-49-en.html

Other than that compare the prices on ebay. and please please PLOX I know this sounds patronising but always run spy checker before you order stuff!!

Cheers, the store I got the PC-Engine from has lots of games, and the owner has a store in Japan where he can order from so I wasn't really planning on ordering online. I just wanted to make sure I wasn't overpaying as I really have no idea which games are rare and what the going rates are.

Now I'll go check on prices for what I've already bought :)