DQ8 was on sale at CC one week for $9.98. That's when I got mine. But right now, it's $19.99 everywhere. Unless you want to wait for it to clear, or use a coupon like jazz2600 said.
I haven't seen Dark Cloud 2 in a long time... Did it go Greatest Hits? I think the first one did. Was $3 clearance at k-mart.
Indigo Prophecy PS2 might be $4 on clearance at k-mart, but YMMV. Check the k-mart thread in deals...