Call a locksmith and see if they have the blank and the machine to cut it. I bought a key from ebay for about $10 and had a locksmith cut it for $40. It took him a few tries (on the same blank) to get it right but it works fine now. It took him about 20 minutes to finally get it working. Make sure you bring the truck with you so he can test fit it. Given my experience, it will not work on the first try. My total cost was about $50.
The one on the left is my Lexus key and the one on the right is the other key for non-Lexus. I could easily get the blank cut identical to the right one from Home Depot or Lowe's but I'm not sure about the Lexus key. It looks different.
I just bought an "ilco" blank off ebay for $10. I only have an ilco key and it works fine in the truck. I will keep you posted on the cutting and whether or not it works... $160 for a key from Lexu$ here, and because I live in BC (bring cash), the Toy/Lex dealer has to send my vin (US truck) to Toyota Canada, who then have to send it to Toyota USA, who then sends the code back to Toyota Canada, who then cuts the key, sends it to the stealership, who then bends me over... No thanks!