I bought mine from Toyota directly for less than $5 each. They can look up the part number in Dealer Daily, find them locally, and get them direct from Toyota. That's what my dealer in CA did. I ordered a box of 10 and paid a lot less than $50 for the case.

 

Irontoad is the online name for a family of dealerships, Toyota, Lexus, etc. I have bought from them and yes you get the true Toyota parts. And actually your shiping invoice will have the dealer's name and address on it. The sad part is I can't order my Lexus and Toyota parts in one order. You can send in a request for pricing on any factory part that you needand they will quote you on it. I bought my oil filters, cabin filters, and mudflap kit for my RX from them. That is because they ship from the different dealerships. Hope this answers your questions.

 

I believe this is the actual family of dealerships, Thompson.
http://www.1800thompson.com/