The one Crester mentioned is at a pretty decent price as it is if you factor in shipping and duty costs. The TRD grill is a discontinued product I think, so it will be more rare as time goes on, and the price will reflect this.
Cheaper alternative would be eBay stuff, but you'd compromise on the quality and fit.
TRD sports grill is actually fake carbon fibre.
Then there is the Altezza grills - Old style - 3 bar, Battle Z etc..
None of these are realy technically black to begin with. They all have a varying degree of chrome or a colored logo (Black and Red).
The nicest one is the one for sale by Johnny sks. Its expensive, but it is pratically brand new.
Other wise, cheap knock offs and used are all you will find.
Knock offs do not fit so well. Used ones, will have to paint or restore.