Looking for new headlights? This guy has them, cheapest yet, $61.99 and free shipping.
97-03 Pontiac Grand Prix Headlights Headlamps Left & Right Pair Set | eBay

Another guy has a front bumper for $88.58. Not sure if those have the groove for the Pontiac logo, and don't know if those are the cheapest they've been, but that's the cheapest I've seen them going for.
New Bumper Cover Front Primered Pontiac Grand Prix 2003 2002 2001 Car 88893300 | eBay