You can get a TRD knob from your Yota dealership for less than the stock knob.
I bought mine for $65 in a group buy. I'll get some info up about it.
EDIT - Got some info about it. Send $63.50 to
Toyotaparts@irontoad.com thru PayPal. Put TRD Shift Knob GB in the subject title. People are still ordering and getting them so it's still going on.