I ordered a switchblade key from a company called dieselbenzdiesel*123 from ebay. I finally received the key after 5 days. He has pretty quick shipping.
The key is from a 2007 Yaris, which is identical to the tC. The key housing seems pretty durable and decent quality. Retrofitting the stock buttons inside the key will not be an option because the buttons on the key are fake. They are hot glued onto the housing of the key. This key will be only used for those who have a secondary key fob for their alarm.
I'm going to go get it cut here in a few so i'll let you guys know how it goes.
This is a warning, I am not responsible for any damage you do to your key, you are responsible for your mishaps!
Dremel w/ Cutoff Wheel
A Spare Key
New Switchblade Key
Torx T6 Screwdriver
Goggles and Dremel, Safety first!
Clamp your key down onto a table with a vice grip
You are now trying to cut the small black chunk out of the top of your key, do this by using a dremel with a cutoff wheel. Be very careful and try not to cut into the black part which contains your immobilizer chip. Also, when you are cutting on the side where the key is closest, try not to cut the base of the key. It's a close fit, but you will be able to get around it.
Now that you have the chip cut out of your old key, it is time to open up the new switchblade key. Only open up the bottom half of the key, the top part contains the spring which allows the key to flip up. I was dumb and opened the top up the first time around and it took me half an hour to try and figure out how to wind the spring back up. so DO NOT OPEN THE TOP PORTION OF THE KEY
Open the bottom half of the key using a Torx T6 screw driver.
Test fit the chip inside the key, placing it as far up as possible. The chip will not work if it is place any lower in the key. Use a few dabs of hot glue to secure it into place.
Reassemble your key and enjoy!
Total cost was 30 dollars for the key, and 1 dollar to have it cut! Not bad! Enjoy guys!
EDIT: This key is not very durable, so don't expect it to last for more than a few months.