They don't really make them anymore, I ended up getting a new one made by Aries 3047 brush guard off of amazon.
http://www.amazon.com/Aries-3047-Bl...&newCar=1&s=automotive&vehicleType=automotive
I have a 2000 explorer as well, the brush guard fits perfectly just had to remove the air dam from the bottom for clearence. The mounting brackets were horrible i couldn't figure out how they intended it to be mounted. They give you a junky 2d picture of something that is 3d. I ended up just drilling a hole in a part of the bracket to make it fit.
The only other option is a hunter grill guard, you can find posts about it here by searching. Its a cheaper brush guard sold on ebay but its made in china, i bought the Aries one because its american/canadian company
edit: you can also check junkyards and clean up an old one