Got Galaga '90 on the block, replaced it with a PCE version. $22 shipped in the US.
I also have a case for Lords of Thunder that I ended up with after my disc got ganked. So if anyone is missing theirs, here is you chance. Case cover has some sticker residue, but you can replace that easy enough. Just cover the shipping, so like $2.
Edit - both items sold.
LoT case is spoken for, that was fast.
And like that, Galaga is goneaga.