We purchased a 2015 RX450h at the end of last year. Unfortunately it only came with one key.
I searched all over the net, called local dealers and locksmiths and finally landed on Belle Lexus
I ordered from them thru parts.Lexus.com. Their initial price was lower than anyone else's for the
smart transmitter and metal key and then Lexus had a 15% Valentines Day sale on top of that.
Received the parts quickly and in great shape (ordered the smart transmitter, metal key, leather fob
and all season mats.)

Just an FYI for anyone looking to order parts, I would highly recommend them.

Also, as an aside, while going thru parts.Lexus.com I put in my zip code (Nashville) and it said the closest
dealer was in Lexington KY. There is one about 5 miles from me in Cool Springs and another just north
of Nashville. I also tried putting in a Knoxville zip knowing there is a dealer there and that showed Atlanta
as the closest one. It showed no dealers in the entire state of TN. Very odd.