I would also buy new games at a max of around $100 too, my last game was tom clancy's splinter cell which was 100 at the time, BUT because it was end of financial year (around July), there was a massive discount on all games at Electronics Boutique and i got it for 20% off ($80!!)
$120. Generally the games I've been buying (in the last few years), which are usually new FPS cost around $100. But if it's a real killer, say if Monolith marketed F.E.A.R for $120, I'd still get it at that.