Well I'd say if you need a shooter, on CD, and it has to be a JP release, then maybe you should get one of those bootleg Sapphires. They are pretty nice and can be had for around $60 shipped. That's a lot for a bootleg, but given the circumstances I think it makes an OK middle ground between a $0.05 CD-R, and a $380 original. Normally when it comes to bootlegs my philosophy is that its OK to have them, but I won't pay actual money for them. For some reason I don't feel this way about this one. I'm not sure why.
My most recent JP-only shooter is actually Burning Angel. Its cheap, and I like it quite a bit. Its a HuCard though, so I don't know if that is something you want to avoid. Its a lot like Super Star Soilder, but its two player, which I appreciate.