Any factory plate from 98-up should work on your 99.
Prices from a few months ago, should be close:
98~2000 front skid plate (stainless):
224.15 list, $168.11 online
Level II front skid plate (black):
$213.03 list, $159.77 online
The factory plates are OK for casual offroading but not rocks or heavy bashing.
Here's a Ranger skid plate from a fab shop. It is reinforced with 2" x 0.120" wall tubing.