Just a quick note. I bought some 09 TRD OEM carpet mats on Ebay last night. To understand better, at the time I bought my '10 in November, the dealership would not give or sell me any floor mats. So...I never got any and no mat retainer clips. The guy I bought the mats from kept his clips for his Weather Techs.
Searching around, I stumbled across the dealership in Bristol, RI, where you can order parts and accessories online. I punched in the part number for the retainer clips and the price for each one is only $0.01!!! That's right, a penny apiece. Other places listed them at anywhere from $0.99 to $2.99 each!
So...I ordered 24 just to see what it would all come to....and the price held, so with shipping, it was less than 10 bucks for 24 clips.
Here's the link: http://www.bristoltoyota.com/
And the address:
706 Metacom Avenue
Bristol, RI 02809-5128