Whoa.......this original post is from WAAAAAY BACK.
anyways, in case it was never answered.........here are the options.
1) BlazingStars for 48,000 yen. That's for the regular grill only.
2) Hilltop . Yep, the same shop that does the half clear/red tail lamps. They will make it for you. The reg grill is 45,000yen, and that bottom grill, which they call 'bumper grill' is another 45,000yen.
I was looking at getting them when they first came out, but I thought that someone in the US would come out w/ a grill for the Odyssey. Be able to save $$ on shipping.