While we're on good deals lately, I got Halo Reach today new for $20...and The Sims 3 for $20 new last week. I didn't have a huge interest in them, but for $20 a piece even one playthrough would warrant its pricetag for me.
As for PGR4..I would have given it to you for free :). I played it twice, never touched it again. Microplay will not let me trade it in because they have too many copies. So it just sits there.